Portable panel light

Abstract

A surface light comprising a base with a battery compartment for holding a battery, an LED circuit, a display unit and a control unit connected to the battery compartment, the LED circuit and the display unit.The control unit is configured to control the LED circuit to output an initial lumen value, to control the display unit to output an initial display when the current remaining battery time is less than a first predetermined time period, to control the LED circuit to output the first lumen value after the first display, to control the display unit to output a second display when the current remaining battery time is less than a second predetermined time period, where the second predetermined time period is less than the first predetermined time period, and to control the LED circuit to output a second lumen value that is less than the first lumen value after the second display.

Description

Cross-reference to related registrations

[0001] This application claims priority over U.S. Preliminary Patent Application No. 63 / 670,160, filed on July 12, 2024, and U.S. Preliminary Patent Application No. 63 / 788,241, filed on April 14, 2025, the entire contents of which are hereby incorporated by reference. Area

[0002] The present invention relates to surface luminaires, in particular portable surface luminaires.

[0003] Mobile lighting systems, which include panel lights, are used to illuminate construction sites or other areas without permanent lighting fixtures, outdoor spaces, and / or rooms without electricity. These construction sites are often located in remote locations, so the panel lights must be transported to the site. Similarly, the construction sites may be located in areas where vehicles have difficulty maneuvering, requiring an operator to carry the panel lights to the work area. Many portable lights, such as flashlights or small lanterns, are easy to transport to the construction sites but do not provide enough light to illuminate the area adequately for working conditions. Other, larger lights, while providing sufficient illumination of the construction site, may be difficult to transport. Summary

[0004] Battery-powered tower lights are practical and effective, providing sufficient illumination for a construction site. However, battery packs have a limited power supply, which can be difficult for a user on a construction site to recognize. Therefore, it is necessary to adjust the light's lumen output based on the remaining battery power and to alert the user when the battery is low. A display unit will notify the user when the battery has reached certain thresholds.

[0005] In one embodiment, the invention provides a surface lamp comprising a base with a battery compartment for receiving a battery, an LED circuit, a display unit and a control unit coupled to the battery compartment, the LED circuit and the display unit.The control unit is configured to control the LED circuit to output an initial lumen value, to control the display unit to output an initial display when the current remaining battery time is less than a first predetermined duration, and after the initial display, to control the LED circuit to output the first lumen value, to control the display unit to output a second display when the current remaining battery time is less than a second predetermined duration, where the second predetermined duration is less than the first predetermined duration, and after the second display, to control the LED circuit to output a second lumen value that is less than the first lumen value.

[0006] In a further embodiment, the invention provides a method for controlling a panel light. The panel light comprises a base with a battery receptacle, an LED circuit, a display unit, and a control unit. The method includes controlling the LED circuit by the panel light's control unit to output a first lumen value, controlling the display unit by the panel light's control unit to output a first reading when the current remaining battery life is less than a first predetermined time period, and controlling the LED circuit by the panel light's control unit after the first reading to output the first lumen value.The method further comprises controlling the display unit by the control unit of the area light to output a second display when the current remaining battery time is less than a second predetermined time period, wherein the second predetermined time period is less than the first predetermined time period, and controlling the LED circuit by the control unit of the area light after the second display to output a second lumen value that is less than the first lumen value.

[0007] In yet another embodiment, the invention comprises a surface-mounted light with a base including a battery compartment for receiving a battery, an LED circuit, and a control unit coupled to the battery compartment and the LED circuit. The control unit is configured to control the LED circuit to output a first lumen value, to control the LED circuit to output a first indication when the current remaining battery life is less than a first predetermined duration, and after the first indication, to control the LED circuit to output the first lumen value when the current remaining battery life is less than a second predetermined duration, wherein the second predetermined duration is less than the first predetermined duration.

[0008] Further aspects of the invention will become clear from the detailed description and the accompanying drawings. Brief description of the drawings Fig. Figure 1 is a perspective view of a portable panel light in a storage configuration. Fig. Figure 2 is a perspective view of the light fixture. Fig. 1 in an open configuration with the mast partially extended. Fig. 3 is a block diagram showing a control unit of the light. Fig. 1 according to some embodiments. Fig. 4 is a flowchart of a procedure for controlling a display unit for the light of Fig. 1 according to some embodiments. Fig. Figure 5 is a time diagram for an Eco mode according to some embodiments. Fig. Figure 6 is a timing diagram for a low battery warning according to some embodiments. Fig. Figure 7 is a time graph for a low battery indicator according to some embodiments. Detailed description

[0009] Before embodiments of the invention are explained in detail, it should be noted that the invention is not limited to the design details and arrangements of components described in the following description or illustrated in the following drawings. The invention is also possible in other embodiments and can be practiced or implemented in various ways.

[0010] The Fig. 1 and Fig. Figure 2 shows a portable panel light 100 (hereinafter also referred to as panel light, work light, or simply light 100) comprising a base 102, a pair of legs 104, and a light body 106 with a mast 108 and a light head 110. The panel light 100 shown in the figures and described below is only one example of a panel light for use with the invention. In other embodiments, the panel light 100 may have other configurations and / or components. For example, the panel light 100 may be a tripod-style light, a fixed-body light, a flashlight, a headlamp, or the like. The legs 104 and the light body 106 of the illustrated embodiment are all rotatably connected to the base 102. The work light 100 can be configured between a storage configuration ( Fig. 1) and one or more open or extended configurations ( Fig. 2) can be converted. In the open configuration, the 110 light head is held above a floor or surface to illuminate the area. In the storage configuration, the 100 work light is compact and portable (e.g., handheld) around a construction site.

[0011] Additionally, the base accommodates 102 electrical components and other components of the 100 work light. A 300 control unit ( Fig. 3) is arranged within the base 102. A user interface 112 is positioned on the outside of the base 102 and communicates with the control unit 300 to control the operation of the work light 100. The user interface 112 can include any number of controls (real or virtual), including but not limited to a power switch, a brightness control, a charging indicator, a mode selection button, an energy-saving button, or various other controls. The user interface 112 can also include a display for showing one or more parameters of the work light 100. For example, the user interface can include a display unit 320 ( Fig. 3) include. In other examples, the display can be a touchscreen display that allows user input via the display. In the illustrated embodiment, the user interface 112 is accessible to an operator both when the work light 100 is in the open configurations and in a storage configuration.

[0012] The work light 100 can optionally be powered by a DC power source 302 ( Fig. 3) (for example, one or more batteries) are powered or connected to an external power supply (e.g., an AC power source). The base 102 includes a battery compartment for the DC power source 302. The battery compartment includes a battery holder with electrical terminals for connecting to the DC power source 302.

[0013] The legs 104 are rotatably connected to the base 102 and can be rotated between the storage configuration, in which the legs 104 are positioned along the sides of the base 102, and the open configuration, in which the distal ends of the legs 104 are turned away from the base 102.

[0014] The light source 106 can be rotated between several positions relative to the base 102. The light source 106 is rotatably connected to an upper end of the base 102 via a rotary mechanism for rotation about a pivot axis between the storage configuration and the open configuration. As previously explained, the light source 106 comprises the mast 108 and the light head 110. In the illustrated embodiment, the mast 108 is a telescopic mast comprising several telescopic sections 200 extending between a first end and a second end. The multiple telescopic sections 200 are displaced relative to each other along a mast axis, allowing the mast 108 to be extended and retracted to produce different mast heights.

[0015] In Fig. Figure 3 shows a block diagram of a control unit 300 of the work light 100 according to some embodiments. The control unit 300 communicates with a power source 302, a user interface 304, an LED driver 306, and a display unit 320. The control unit 300 may include a processing circuit 310 and an input / output module (“I / O module”) 314.

[0016] The power source 302 can be a removable power source, for example, a battery. In other embodiments, however, the power source can be powered by a utility (e.g., via an AC input) or a constant current source (e.g., an external DC power supply). In one example, the power source 302 can be a rechargeable battery, such as a lithium-ion battery, a lithium iron phosphate battery, etc. In some examples, the rechargeable battery can be a rechargeable power tool battery. The in Fig. The power source 302 shown can be a 12 VDC battery, an 18 VDC battery, a 40 VDC battery, and / or another battery voltage required for a specific application. The power source 302 can supply power to the various components of the work light 100, such as the control unit 300 and the LED driver 306.

[0017] The control unit 300 comprises the processing circuit 310. The processing circuit 310 can include one or more electronic processors 316 and a storage device 318. The electronic processors 316 can be connected to one or more of the user interfaces 304, the LED driver 306, the display unit 320, etc. The electronic processors 316 can be implemented as a programmable microprocessor, as an application-specific integrated circuit (“ASIC”), as one or more field-programmable gate arrays (“FPGA”), as a group of processing components, or with other suitable electronic processing components.

[0018] The storage device 318 (for example, a non-volatile, computer-readable medium) comprises one or more devices (for example, RAM, ROM, flash memory, hard disk storage, etc.) for storing data and / or computer code for executing or facilitating the various processes, layers, and modules described herein. The storage device 318 may include database components, object code components, script components, or other types of code and information to support the various activities and information structures described in this application. By way of example, the storage device 318 is connected to the electronic processor 316 via the processing circuit 310 and may include computer code for executing (for example, by the processing circuit 310 and / or the electronic processor 316) one or more of the processes described herein.For example, the storage device 318 can store computer code to execute a process to indicate a low battery charge (. Fig. 4) The I / O module 314 can be configured to connect directly to one or more devices, such as a power supply, a power monitor, etc. In one embodiment, the I / O module 314 can use general-purpose I / O (GPIO) ports, analog inputs, digital inputs, etc.

[0019] The user interface 304 can be similar to the user interface 112 described above and include various controls described above, including a brightness control. The brightness control can send a signal to the control unit 300 via the I / O module 314. The control unit 300 can, for example, be configured via the processing circuit 310 to detect the charge level of the power source 302 and control the LED circuit 308 and the display unit 320 based on this charge level. The control unit 300 can also control the brightness of the LED circuit 308 (e.g., a lumen value) based on the charge level of the power source 302. For example, the brightness of the LED circuit 308 can decrease as the charge level of the power source 302 decreases. The control unit 300 can be configured to receive a signal from the user interface 304 specifying a desired brightness level for the LED circuit 308.In one embodiment, the LED circuit 308 can comprise one or more LEDs and be provided on the light head 110.

[0020] The control unit 300 can control the display unit 320 to provide an indication when the charge level of the power source 302 falls below a threshold. In one embodiment, the display unit 320 can comprise one or more LEDs and be located at the user interface 304, near the power source 302, or elsewhere on the base 102 of the work light 100. The display unit 320 can be an LED array provided within the LED circuit 308, such that each indication provided by the display unit 320 changes the brightness of the LED circuit 308. For example, the LED array can flash for a period of time (e.g., 2 to 10 seconds) to provide an indication of a low battery level, thereby changing the brightness of the LED circuit for that period and visually notifying a user in a way that is difficult to miss.Instead of blinking during the period, the LED array can change its colors. If the user interface 304 is a display (e.g., an LCD display), the display unit 320 can be a notification that appears on the display. The display unit can be, for example, a colored (e.g., yellow, orange, or red) field that appears on the display with or without a warning message (e.g., "Low Battery," "Security Mode," "Standby Mode," and / or an image of a turtle, a lightbulb, or another symbol).

[0021] The control unit 300 can provide an output to the LED driver 306 indicating a desired brightness of the LED circuit 308. In one embodiment, the LED driver 306 can be configured to control the brightness of the LED circuit 308 using an analog signal. In other examples, a PWM control system can be used to control the brightness of the LED circuit 308.

[0022] In one embodiment, the LED driver 306 is an MP24830 from MPS®. However, other LED driver circuits / devices are also provided, depending on the application. In one embodiment, the control unit 300 can provide an input to the LED driver 306 to control whether the dimming of the LED circuit 308 is analog dimming or PWM dimming. For example, the control unit 300 can supply a signal to pin 5 of the LED driver 306 to control the dimming mode. The LED driver 306 is then configured to supply an output signal to the LED circuit 308 to control the power of the LEDs in the LED circuit 308. The LED circuit 308 can be dimmed by the LED driver 306 based on the charge level of the power source 302. In one embodiment, the LED circuit 308 can be controlled by the LED driver 306 based on a nominal operating voltage of the power source 302.For example, if a battery with a first nominal operating voltage is connected to the work light 100, the brightness of the LED circuit 308 can be at a first level, and if a battery with a second nominal operating voltage is connected to the work light 100, the brightness of the LED circuit 308 can be at a second level.

[0023] Fig. Figure 4 is a flowchart of a procedure 400 for controlling a display unit of the work light 100. Although the depicted procedure 400 includes certain steps, not all steps need to be performed or performed in the sequence shown. The procedure 400 can be executed by the work light 100 (e.g., by the control unit 300 of the work light 100).

[0024] Procedure 400 involves determining whether the work light 100 is powered by battery current (in decision step 402). The control unit 300 can determine whether the work light receives a DC or AC input. If the control unit 300 determines that the work light 100 is not powered by battery current (NO in decision step 402), procedure 400 proceeds to step 404. If the control unit 300 determines that the work light 100 is powered by battery current (YES in decision step 402), the procedure proceeds to step 404.

[0025] In step 404, the control unit 300 clears the low battery indicator (LBI) flags. The LBI flags can be set in the processing circuit 310. In step 406, the control unit 300 draws the remaining current from the battery. For example, the control unit can draw the remaining milliampere-hours (mAh) from the power source 302 to determine the charge capacity of the power source 302. In decision step 408, the control unit 300 determines whether an LBI timer has reached a first threshold time. For example, the control unit 300 determines whether the LBI timer has reached 10 seconds. The LBI timer can be implemented in the processing circuit 310, and specifically in the processor 316. If the control unit 300 determines that the first threshold time has not been reached (NO in decision step 408), the process 400 returns to decision step 402.If the control unit 300 determines that the first threshold time has been reached (YES in decision step 408), the procedure continues with decision step 410.

[0026] In decision step 410, the control unit 300 determines whether the LED circuit 308 of the work light 100 is switched on. For example, the control unit 300 determines whether current flows to the LED circuit 308 via the LED driver 320. If the LED circuit 308 is not switched on (NO in decision step 410), the procedure 400 returns to decision step 402. If the LED circuit 308 is switched on (YES in decision step 410), the procedure continues with decision step 412.

[0027] In decision step 412, the control unit 300 determines whether a light mode of the LED circuit 308 is a low mode. For example, the LED driver 306 can drive the LED circuit 308 in a low mode, a medium mode, a high mode, and an eco mode. The low mode can be less than the medium mode and the high mode. The medium mode can be less than the high mode. The eco mode can be less than the low mode, the medium mode, and the high mode. For example, the low mode can be about 50% of the high mode, the medium mode can be about 75% of the high mode, and the eco mode can be about 25% of the high mode. In other embodiments, the modes can have different relative intensities. The different modes can also be referred to as first mode, second mode, third mode, fourth mode, and the like.The control unit 300 can determine the lighting mode of the LED circuit 308 based on the current consumption of the LED driver 306. If the LED circuit 308 is not in a low mode (NO in decision step 412), the procedure 400 continues with decision step 414. If the LED circuit 308 is in a low mode (YES in decision step 412), the procedure continues with step 416.

[0028] In decision step 414, the control unit 300 determines whether the light mode of the LED circuit 308 is a medium mode. If the LED circuit 308 is not in a medium mode (NO in decision step 414), the procedure 400 continues with decision step 418. If the LED circuit 308 is in a medium mode (YES in decision step 414), the procedure continues with step 416.

[0029] In decision step 418, the control unit 300 determines whether the light mode of the LED circuit 308 is a high mode. If the LED circuit 308 is not in a high mode (NO in decision step 418), the procedure 400 continues with step 420. If the LED circuit 308 is in a high mode (YES in decision step 418), the procedure continues with step 416.

[0030] In step 420, the control unit 300 determines whether the light mode of the LED circuit 308 is in Eco mode. In step 422, the control unit 300 controls the LED circuit 308 so that it remains in Eco mode for the entire duration of the power source 302's discharge. For example, during Eco mode, the LED driver 306 controls the LED circuit 308 so that it maintains a minimum lumen output that does not decrease as the charge capacity of the power source 302 decreases.

[0031] In step 416, the control unit 300 sets a battery current consumption from the power source 302 based on a mode. For example, the control unit 300 can set the battery current consumption to a first value for the low mode, a second value (greater than the first value) for the medium mode, and a third value (greater than the second value) for the high mode. In step 424, the control unit 300 calculates an instantaneous remaining time based on an instantaneous charge capacity and the current battery current consumption of the power source 302. The procedure 400 continues with decision step 426.

[0032] In decision step 426, the control unit 300 determines whether a low battery warning has been completed. For example, the control unit 300 can determine whether the display unit 320 and / or the LED circuit 308 provides an initial indication. Fig. Figure 5 is a timing diagram 500 for Eco mode, which includes the first indication (e.g., the low battery warning 502). The timing diagram 500 for Eco mode also includes a low battery indicator 504 (e.g., a low battery indicator), which is provided for an initial period of time (e.g., 5 to 15 minutes) after the low battery warning 502. During this initial period after the low battery warning 502, the LED circuit 308 remains in its set light mode (e.g., the LED driver 306 keeps the LED circuit 308 at a lumen value corresponding to one of the modes "low," "medium," or "high"). After the low battery indicator 504 is triggered, the LED circuit 308 is switched to Eco mode (e.g., the LED driver 306 controls the LED circuit 308 so that it remains at the first lumen value). The LED circuit 308 can remain in Eco mode for a second period of time (e.g., 5 to 15 minutes).After the second time period has elapsed, the LED driver 306 switches off the LED circuit 308.

[0033] With reference to Fig. 6. The low battery warning 502 (e.g., the low battery warning from decision step 426) can be a pulse sequence from LED circuit 308 or an LED array provided in LED circuit 308. For example, there can be a total of three pulses, during which a lumen value output by LED circuit 308 decreases from an initial lumen value corresponding to one of the modes "low," "medium," and "high" to the first lumen value corresponding to Eco mode. The pulse can be a sawtooth pulse (shown in Fig. 6) in which the lumen value decreases linearly to the initial lumen value over the course of one second and then immediately rises back to the original lumen value over the course of 750 milliseconds (ms). The total duration of the pulses can be 5.25 seconds. Alternatively or additionally, the battery level indicator 502 can be a pulse sequence from the display unit 320, which is essentially like the one in Fig. The sawtooth pulse shown in section 6 is executed.

[0034] Returning to Fig. 4. If the control unit 300 determines that the low battery warning is not complete (NO in decision step 426), the procedure 400 continues with decision step 428. If the control unit 300 determines that the low battery warning is complete (YES in decision step 426), the procedure 400 continues with decision step 432.

[0035] In decision step 428, the control unit 300 determines whether the current remaining time of the power source 302 is less than a first predetermined duration (e.g., 20 minutes). If the current remaining time is not less than the first predetermined duration (e.g., the current remaining time is greater than 20 minutes) (NO in decision step 428), the procedure 400 returns to decision step 402. If the current remaining time is less than the predetermined duration (YES in decision step 428), the procedure 400 continues with step 430.

[0036] In step 430, the control unit 300 executes the low battery warning. For example, the control unit 300 can determine whether the display unit 320 and / or the LED circuit 308 provides a second indication. The second indication can be the same as the first indication. For example, the second indication can be the low battery warning 502.

[0037] Returning to Fig. 4. In decision step 432, the control unit 300 determines whether the current remaining time is less than a second predetermined duration (e.g., 10 minutes). The second predetermined duration is shorter than the first predetermined duration. If the current remaining time is not shorter than the second predetermined duration (e.g., the current remaining time is longer than 10 minutes) (NO in decision step 432), the procedure 400 returns to decision step 402. If the current remaining time is less than the second predetermined duration (YES in decision step 432), the procedure 400 proceeds to step 434. In some embodiments, the threshold for the remaining time in steps 428 and 432 can be different durations (e.g., 10 minutes and 5 minutes, 5 minutes and 1 minute, etc.), depending on the battery or the desired operation of the area light 100.

[0038] In step 434, the control unit 300 performs a low battery warning. For example, the control unit 300 can determine whether the display unit 320 and / or the LED circuit 308 provides a third indication. The third indication can be the same as the first and / or second indication or different from the first and / or second indication. With reference to Fig. 7. The low battery indicator 504 (e.g., the third indicator from step 434) can be a pulse sequence from the LED circuit 308 or an LED array provided in the LED circuit 308. For example, there can be a total of three pulses in which a lumen value output by the LED circuit 308 decreases from an initial lumen value corresponding to one of the modes "low," "medium," and "high" to the first lumen value corresponding to the Eco mode. The pulse can be a sawtooth pulse (see Fig. 7), in which the lumen value decreases linearly to the first lumen value over the course of one second and then immediately rises again to the original lumen value over the course of 750 ms. The total duration of the pulses can be 4.5 seconds. At the end of the last pulse (e.g., after 4.5 seconds), the lumen value drops to the first lumen value corresponding to Eco mode. The control unit 300 can maintain the lumen value at the first lumen value corresponding to Eco mode for a predetermined duration (e.g., the second duration) until the power source 302 is completely depleted or the work light 10 is switched off. Alternatively or additionally, the low battery indicator 504 can be a pulse sequence from the display unit 320, essentially like the one described in Fig. The sawtooth pulse shown in step 7 is executed. Procedure 400 then proceeds to step 422 to switch to and operate in Eco mode for the remainder of the charge state.

[0039] Accordingly, the invention provides a surface lamp that displays a value based on the remaining operating time of a power source coupled to the surface lamp.

[0040] The embodiment described above and illustrated in the drawings is shown only as an example and is not intended to limit the concepts and principles of the present invention. As such, it is pointed out that various modifications to the elements and their configuration and arrangement are possible without deviating from the concept and scope of the present invention. Various features and advantages of the invention are set forth in the following claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 670,160

[0001] US 63 / 788,241

[0001]

Claims

[1] A surface luminaire comprising: a base that includes a battery holder for receiving a battery; an LED circuit; a display unit; and a control unit that is coupled with the battery compartment, the LED circuit, and the display unit, and is configured to controls the LED circuit so that it outputs an initial lumen value, the display unit is controlled to output an initial reading when the current remaining battery time is less than a first predetermined time period, After the first display, the LED circuit is controlled to output the first lumen value. the display unit is controlled to output a second display when the current remaining battery time is less than a second predetermined time period, where the second predetermined time period is less than the first predetermined time period, and After the second display, the LED circuit is controlled to output a second lumen value that is less than the first lumen value. [2] The surface lamp according to claim 1, wherein the first display is a first pulse sequence of the display unit. [3] The surface lamp according to claim 2, wherein the first pulse sequence comprises three pulses. [4] The surface lamp according to claim 2, wherein the first pulse sequence lasts 5.25 seconds. [5] The surface lamp according to claim 1, wherein the display unit is part of the LED circuit. [6] The surface light according to claim 5, wherein during the first display a lumen value of the LED circuit decreases from the first lumen value to another lumen value. [7] The surface lamp according to claim 6, wherein the lumen value decreases linearly from the first lumen value to the other lumen value over a first period and wherein the lumen value increases linearly from the other lumen value to the first lumen value over a second period which differs from the first period. [8] The surface lamp according to claim 1, wherein the second display is a second pulse sequence of the display unit. [9] The surface lamp according to claim 8, wherein the second pulse sequence comprises two and a half pulses. [10] The surface lamp according to claim 8, wherein the second pulse sequence lasts 4.5 seconds. [11] The surface lamp according to claim 1, wherein the display unit is separate from the LED circuit and is arranged on the base. [12] A method for controlling a surface light, wherein the surface light comprises a base with a battery receptacle for receiving a battery, an LED circuit, a display unit and a control unit, wherein the method comprises: Control of the LED circuit by the control unit of the surface light to output an initial lumen value; Control of the display unit by the control unit of the surface lamp to output an initial display when the current remaining battery time is less than a first predetermined time period; Control of the LED circuit by the control unit of the surface light after the first display in order to output the first lumen value; Control of the display unit by the control unit of the surface lamp to output a second display when the current remaining battery time is less than a second predetermined time period, where the second predetermined time period is less than the first predetermined time period; and Control of the LED circuit by the control unit of the surface light and after the second display to output a second lumen value that is smaller than the first lumen value. [13] The method according to claim 12, wherein controlling the display unit to output the first display comprises controlling the display unit to output a first pulse sequence. [14] The method according to claim 12, wherein controlling the display unit to output the second display comprises controlling the display unit to output a second pulse sequence. [15] The method according to claim 12, wherein the control unit controls the LED circuit so that it outputs the first lumen value for a second period of time, and wherein the method further comprises the control unit of the area light controlling the LED circuit so that it is switched off after the second period of time. [16] The method according to claim 12, wherein the display unit is part of the LED circuit, wherein controlling the display unit to output the first display comprises controlling the LED circuit to decrease from the first lumen value to another lumen value, and wherein controlling the display unit to output the second display comprises controlling the LED circuit to decrease from the first lumen value to another lumen value. [17] A surface lamp comprising: a base that includes a battery holder for receiving a battery; an LED circuit; and a control unit coupled with the battery compartment and the LED circuit, the control unit being configured to: to control the LED circuit to output an initial lumen value, to control the LED circuit to output an initial indication when the current remaining battery time is less than a first predetermined time period, After the first display, control the LED circuit so that it outputs the first lumen value, to control the LED circuit so that it outputs a second indication when the current remaining battery time is less than a second predetermined time period, where the second predetermined time period is less than the first predetermined time period, and After the second display, the LED circuit is controlled so that it outputs a second lumen value that is lower than the first lumen value. [18] The surface lamp according to claim 17, wherein the first display is a first pulse sequence of an LED arrangement of the LED circuit. [19] The surface lamp according to claim 17, wherein the second display is a second pulse sequence of an LED arrangement of the LED circuit. [20] The surface lamp according to claim 17, wherein the control unit controls the LED circuit to output the first lumen value by setting a battery current draw from the battery to a first value corresponding to the first lumen value.

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