Photometric compensation method for testing the optical performance of lamps

Abstract

The present invention discloses a photometric compensation method for testing the optical performance of a lamp, comprising the following steps: S1, obtaining standard test data data1 of a qualified lamp; S2, obtaining actual test data data2 of the lamp to be tested; S3, fitting and benchmarking the standard test data data1 with the actual test data data2, and obtaining the most matching preliminary data position of the actual test data data2 in the standard test data data1; S4, position compensation of the preliminary data position to obtain the final data position; S5, determining the final photometric value of the lamp to be tested according to the final data position. The present invention can not only shorten the test time, improve the production line test efficiency, and meet the production requirements; it can also improve the influence of heat accumulation on the measurement results and improve the accuracy of the measurement results.

Description

Technical Field

[0001] The invention relates to the technical field of lamp testing, and in particular to a photometric compensation method for testing the optical performance of a lamp. Background Art

[0002] Headlights are tools for lighting the road at night, and they are also tools for issuing various vehicle driving signals. Headlights are generally divided into headlights, taillights, turn signals, fog lights, etc. Before the headlights leave the factory, the performance of the headlights (such as optical performance, sealing performance, etc.) needs to be tested. When conducting optical testing of headlights, regulations require that the photometric data must be stable before regulatory measurement and judgment can be made. The thermal stability time of the lamp generally needs to be achieved 30 minutes after lighting, which greatly prolongs the test time and affects the detection efficiency. Especially in the design verification stage, multiple changes and verifications are required, and as the number of projects increases, the testing machines of headlight companies cannot meet the testing needs.

[0003] Moreover, according to the testing process, the headlights will be subjected to high-temperature baking to relieve stress and electrical testing before the optical performance test. For example, after high-temperature baking, heat will accumulate inside the headlight. If the optical performance test of the lamp is directly carried out at this time, the heat accumulation will affect the test accuracy; or, the lamp needs to be placed on other workstations for heat dissipation and cooling. During cooling, a cooling device (such as a fan) is required, which will not only take up testing work, but also increase costs. For example, when conducting electrical testing, the lamp needs to be lit for 20 seconds. After lighting, heat will accumulate inside the headlight, which will also affect the subsequent light intensity detection accuracy. Therefore, it is necessary to propose a new detection method that can improve the impact of heat accumulation on the test results and improve the detection efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problem of the influence of heat accumulation on the light intensity test of lamps, the present invention provides a photometric compensation method for testing the optical performance of lamps, which can not only shorten the test time, improve the production line test efficiency and meet the production requirements; but also improve the influence of heat accumulation on the measurement results and improve the accuracy of the measurement results.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a photometric compensation method for testing the optical performance of a lamp, comprising the following steps:

[0006] S1, obtain standard test data data1 of qualified lamps;

[0007] S2, obtaining actual test data data2 of the lamp to be tested;

[0008] S3, fitting and aligning the standard test data data1 with the actual test data data2 to obtain a preliminary data position that best matches the actual test data data2 in the standard test data data1;

[0009] S4, performing position compensation on the preliminary data position to obtain a final data position;

[0010] S5. Determine the final photometric value of the lamp to be tested according to the final data position.

[0011] Furthermore, in step S1, obtaining standard test data data1 of qualified lamps specifically includes:

[0012] Continuously measuring the standard photometric data of the qualified lamp until a stable state is reached, and obtaining a standard photometric attenuation change curve of the qualified lamp;

[0013] Normalizing the standard luminosity attenuation change curve, and calculating standard gradient data of each data point in the standard luminosity attenuation change curve;

[0014] The standard gradient data is used as the standard test data data1.

[0015] Furthermore, in step S2, actual test data data2 of the lamp to be tested is obtained, which specifically includes:

[0016] Continuously measuring the lamp to be tested to obtain a set of actual photometric data, normalizing the actual photometric data, and calculating actual gradient data of each data point in the actual photometric data;

[0017] The actual gradient data is used as the actual test data data2.

[0018] Furthermore, the qualified lamp is continuously measured until a stable measurement time t 1 At least 30 minutes, measuring interval Δt 1 Less than 1 second; the continuous measurement time t of the lamp to be tested 2 At least 20 seconds, measuring interval Δt 2 Measurement interval Δt with qualified lamps 1 same.

[0019] Furthermore, the standard luminosity attenuation change curve is normalized, including:

[0020] Remove the first standard photometric data collected For the remaining standard photometric data Normalization is performed, and the formula for normalization is as follows:

[0021]

[0022] in, Represents normalized data, n is a positive integer, 1<n≤L 1 , L 1 Represents the total number of standard photometric data, that is, a total of L 1 -1 normalized data;

[0023] Calculate the standard gradient data for the normalized data using the formula:

[0024]

[0025] in, Represents the Nth standard gradient data obtained by normalizing the standard data, 1≤N<L 1 -1. Further, in step S3, the calculation formula of the preliminary data position is:

[0026] Index = argmin(ΔG p )

[0027] Among them, Index represents the time position in the standard luminosity attenuation curve, ΔG p Represents the gradient data change sequence G of the actual photometric data [L1 / 2] ~G L1 The sum of the squares of the differences between the standard gradient data sequence of the corresponding length at position p in the standard photometric data, where p is in the range of 1≤p<L 1 -L 2 +1, L 2 Indicates the total number of data of actual photometric data.

[0028] Furthermore, ΔG p The calculation formula is:

[0029]

[0030] Among them, G M represents the actual gradient data, [] represents the rounding operation, represents the p+M-1th standard gradient data obtained by normalizing the data, where G M The expression is: Among them, 1≤M<L 2 , Indicates the actual photometric data E m The normalized data, m is a positive integer, 1<m≤L 2 .

[0031] Furthermore, in step S4, the formula for position compensation of the preliminary data position is:

[0032] Index compen =Index+[a×e b(Δs-c) ]

[0033] Among them, a, b, c are all constants, and Δs represents the variable introduced by photometric compensation, and its expression is:

[0034]

[0035] in, Represents the Index+mth standard photometric data.

[0036] Further, the final data position Index is obtained compen After that, the actual final photometric value at time T is calculated as:

[0037]

[0038] Among them, E T It indicates the actual photometric value of the lamp under test at time T. Indicates the standard photometric data of qualified lamps at time T, Indicates the index of the qualified lamp in the final data position compen Standard photometric data at E last It indicates the actual photometric data of the lamp under test obtained from the last measurement in the continuous measurement.

[0039] The beneficial effect of the present invention is that the photometric compensation method for testing the optical performance of a lamp of the present invention introduces a photometric attenuation gradient, matches a small attenuation gradient of the lamp to be tested with the standard attenuation speed of a qualified lamp, finds the most suitable measurement time position, and then calculates the photometric value of the lamp to be tested at a stable state or at other times according to the most suitable measurement time position. In this way, on the one hand, the test time can be shortened.

[0040] On the one hand, it can improve the test efficiency of the production line and meet the production requirements; on the other hand, it can improve the influence of heat accumulation on the measurement results and improve the accuracy of the measurement results. It is no longer necessary to prepare other stations for lamp cooling and heat dissipation, which can also save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0042] Figure 1 The present invention is a flow chart of a photometric compensation method for testing the optical performance of a lamp.

[0043] Figure 2It is the luminance attenuation variation curve of different lamps of the present invention.

[0044] Figure 3 It is a schematic diagram of different positions of the light beam of the lamp of the present invention.

[0045] Figure 4 It is the luminance attenuation variation curve of the same lamp at different positions of the present invention.

[0046] Figure 5 It is the luminance attenuation change curve of the same lamp of the present invention after baking and without baking.

[0047] Figure 6 It is the luminance attenuation change curve of the same lamp of the present invention when it is lit for 5 minutes and when it is not lit.

[0048] Figure 7 It is the luminance attenuation variation curve of different lamps of the present invention under normal conditions.

[0049] Figure 8 It is a schematic diagram of matching the actual gradient data (short line segments) of the present invention with the standard gradient data (long curves). DETAILED DESCRIPTION

[0050] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] like Figure 1 As shown, the photometric compensation method for testing the optical performance of a lamp of the present invention comprises the following steps:

[0054] S1. Obtain standard test data data1 of qualified lamps.

[0055] S2. Obtain actual test data data2 of the lamp to be tested.

[0056] S3. Fit and align the standard test data data1 with the actual test data data2 to obtain the most matching preliminary data position of the actual test data data2 in the standard test data data1.

[0057] S4. Perform position compensation on the preliminary data position to obtain the final data position.

[0058] S5. Determine the ratio between the actual test data data2 and the standard test data data1 according to the final data position, and obtain the final photometric value of the lamp to be tested according to the ratio.

[0059] In other words, the present invention can find the position of the actual test data in the standard test data that best matches the actual test data by matching the actual test data with the standard test data, so that the final photometric value of the lamp under test when it is stable can be calculated according to the ratio. In this way, on the one hand, the influence of heat accumulation of the lamp on the measurement result can be improved, and on the other hand, the detection efficiency can be significantly improved.

[0060] Specifically, in step S1, the standard test data data1 of the qualified lamp is obtained, which specifically includes: continuously measuring the standard luminance data of the qualified lamp until it is in a stable state, and obtaining the standard luminance attenuation change curve of the qualified lamp; normalizing the standard luminance attenuation change curve, and calculating the standard gradient data of each data point in the standard luminance attenuation change curve; and using the standard gradient data as the standard test data data1. It should be noted that the qualified lamp is continuously measured until the stable measurement time t 1 At least 30 minutes, measuring interval Δt 1Less than 1 second. The basis for judging whether a stable state is reached is that the change in luminous value within 15 minutes is less than 3%. Generally speaking, the lamp can reach a stable state after being lit for 30 minutes, and the measurement interval can be set to 0.5s. According to the collected standard luminous data, a standard luminous attenuation change curve (i.e., a curve showing the change of standard luminous data over time) can be drawn. As the lighting time of the lamp increases, the luminous data of the lamp will gradually decay until it reaches stability. The luminous data in a stable state is used to determine whether the optical performance of the lamp meets regulatory requirements. Each data point of the standard luminous attenuation change curve is normalized for subsequent analysis. After normalization, the standard gradient data of each data point in the standard luminous attenuation change curve is calculated, that is, the change trend of the standard luminous attenuation change curve can be obtained.

[0061] Specifically, in step S2, obtaining the actual test data data2 of the lamp to be tested specifically includes: continuously measuring the lamp to be tested to obtain a set of actual photometric data, normalizing the actual photometric data, and calculating the actual gradient data of each data point in the actual photometric data; and using the actual gradient data as the actual test data data2. It should be noted that the continuous measurement time t of the lamp to be tested is 2 At least 20 seconds, measuring interval Δt 2 Measurement interval Δt with qualified lamps 1 The same, for example, is also set to 0.5s. The continuous measurement time of the lamp to be tested is much shorter than that of the qualified lamp. Each photometric measurement can obtain an actual photometric data. Assuming that the lamp to be tested is measured for a total of 30s with an interval of 0.5s, a total of 60 actual photometric data can be obtained. These 60 actual photometric data can also be plotted into a short photometric attenuation curve. In order to facilitate analysis, the actual photometric data is also normalized and the actual gradient data is calculated.

[0062] That is to say, in this embodiment, the data of qualified lamps are used as benchmark data, and the actual data of the lamps to be tested are benchmarked with the benchmark data to obtain the luminous value of the lamps to be tested when they are stable. This not only saves test time and improves test efficiency, but also improves the influence of heat accumulation caused by other processes on the test results, thereby improving the accuracy of the test results.

[0063] Specifically, the standard luminosity attenuation change curve is normalized, including: removing the first standard luminosity data collected For the remaining standard photometric data Normalization is performed, and the formula for normalization is as follows: in, Represents normalized data, n is a positive integer, 1<n≤L 1 , L 1Represents the total number of standard photometric data, that is, a total of L 1 -1 normalized data. Calculate the standard gradient data for the normalized data, the calculation formula is: in, Represents the Nth standard gradient data obtained by normalizing the standard data, 1≤N<L 1 -1.

[0064] It should be noted that, since the photometric data is collected by a sensor, which is usually an integral measurement, the first collected data may be relatively small because the lamp is not turned on during the first part of the integration time, and the lamp is fully turned on during the second part of the integration time. Therefore, when processing the data, the first collected photometric data will be discarded. In this embodiment, when the standard photometric data and the actual photometric data are normalized, the first collected data is discarded. Assume that the qualified lamps are continuously measured and collected a total of L 1 Standard photometric data The lamps to be tested are measured continuously and a total of L 2 Actual photometric data When performing normalization, exclude the first collected data and E 1 , the normalization of standard photometric data is: n is a positive integer, 1<n≤L 1 ; The normalization of actual photometric data is: 1≤M<L 2 , Indicates the actual photometric data E m Normalized data, m is a positive integer, 1<m≤L 2 After obtaining the normalized data, the gradient data can be calculated. The gradient data can show the decay speed of the photometric data and is the basis for matching the actual photometric data with the standard photometric data. The gradient calculation formula for standard normalized data is: The actual gradient formula for normalized data is: In this way, the gradient data between two adjacent photometric data can be obtained.

[0065] After obtaining the standard gradient data and the actual gradient data, the least squares method can be used for fitting to find the part where the actual gradient data and the standard gradient data are most consistent, thereby finding the optimal data position (such as Figure 8 The calculation formula of the preliminary data position is: Index = arg min (ΔG p ), where Index represents the time position in the standard luminosity attenuation curve, ΔG p Represents the gradient data change sequence G of the actual photometric data[L1 / 2] ~G L1 The sum of the squares of the differences between the standard gradient data sequence of the corresponding length at position p in the standard photometric data, where p is in the range of 1≤p<L 1 -L 2 +1. ΔG p The calculation formula is: Among them, G m represents the actual gradient data, [] represents the rounding operation, Indicates the p+M-1th standard gradient data obtained by normalizing the data. That is, Index represents the best matching time position found by fitting. Since the effect of heat on luminosity attenuation is not completely consistent with the effect of time on light intensity attenuation, after obtaining the preliminary data position Index, a secondary correction is required. The formula for position compensation of the preliminary data position is: Index compen =Index+[a×e b(Δs-c) ], where a, b, and c are all constants, which need to be calibrated according to the heat dissipation and power of the lamp to be tested. For example, taking the rear fog lamp as an example, a = 10, b = 30, c = 0.065, and Δs represents the variable introduced by the photometric compensation. The value of Δs is related to the difference area between the actual measurement data and the preliminary positioning data of the standard data, and its expression is: in, Indicates the Index+mth standard photometric data. Thus, a more accurate time position Index can be obtained. compen . Get the final data position Index compen After that, the actual final photometric value at time T is calculated as: Among them, E T It indicates the actual photometric value of the lamp under test at time T. Indicates the standard photometric data of qualified lamps at time T, Indicates the index of the qualified lamp in the final data position compen Standard photometric data at E last Indicates the actual photometric data of the lamp under test obtained in the last measurement in the continuous measurement. In other words, after determining the final position of the actual photometric data in the standard light attenuation curve, it is possible to determine the position of the lamp under test in Index. compen The photometric data at that moment is At this point, if you want to obtain the photometric data of the lamp under test at other times, you can use the formula Calculation shows that, for example, the luminosity of the lamp under test when it is stable is: E 3600 It corresponds to the luminosity of the lamp under test when it is lit for 30 minutes (i.e. when it reaches stability).

[0066] That is to say, when obtaining the stable photometric value of the lamp to be tested, the present invention does not need to measure for a full 30 minutes. By collecting a part of the data (for example, measuring 30 seconds) and matching it with the standard data, the time position that best matches the light attenuation is found, and the stable photometric value or the photometric value at other times is obtained by converting it through a formula. In this way, not only can the measurement time be significantly reduced, the detection efficiency can be improved, and the cost can be reduced; but also the influence of heat accumulation on the test results can be improved, and the accuracy of the test results can be improved.

[0067] Next, experimental data is used to demonstrate the feasibility of this method.

[0068] Figure 2 This is the luminous attenuation curve of four rear fog lamps of the same type at (0, 0). The continuous detection time is 30 minutes, the measurement interval is 0.5 seconds, and a total of 3600 data are obtained. After removing the first luminous data and performing normalization processing, four luminous attenuation curves can be obtained. The horizontal axis represents the test time, and the vertical axis represents the normalized data. It can be seen from the figure that the luminous attenuation curves of the same type of rear fog lamps have basically the same change trend. The normalized data gradually decreases with the test time and eventually stabilizes. Therefore, it is feasible to use the test data of qualified lamps as standard data.

[0069] Figure 4 It is the luminous intensity attenuation curve of the same lamp at different positions. The light beam emitted by the lamp is generally conical, with the center of the light beam at (0, 0). Taking the center of the light beam as the reference, the upper, lower, left and right are offset by 5° respectively (such as Figure 3 As shown in the figure, four other positions (0, 5), (0, -5), (5, 0), (-5, 0) can be obtained. The luminous attenuation change of the lamp is measured at these five positions respectively. The test instrument is placed 1.2 meters in front of the center point of the lamp for measurement. The measured data are normalized respectively to obtain five luminous attenuation change curves. It can be seen from the figure that the luminous attenuation change trends measured at different positions of the same lamp are basically the same.

[0070] Figure 5 It is the photometric attenuation curve of the rear fog lamp after being baked in an oven at high temperature for 30 minutes and then taken out for photometric measurement. The black curve represents the attenuation curve after high-temperature baking, and the gray curve is the attenuation curve at room temperature without baking. Figure 6 This is the attenuation curve of the lamp after it is lit for 5 minutes before testing and then the photometric measurement is performed. The black curve represents the attenuation curve measured after the lamp is lit for 5 minutes, and the gray curve is the attenuation curve at room temperature without being lit in advance. Figure 5 and Figure 6It can be found that the light intensity of the lamp with heat accumulation decays very quickly in the first 8 seconds or so, and then the decay rate decreases sharply, indicating that heat accumulation has a great influence on the photometric measurement of the lamp, seriously affecting the accuracy of the test results. Figure 7 These are the decay curves of different lamps (4 curves) when lit for 50 seconds at room temperature (without heat accumulation). Figure 7 It can be seen that the attenuation curves of different lamps are slightly different when there is no heat accumulation.

[0071] The test data of a qualified rear fog lamp at position (0, 0) is selected as the standard data, and then three rear fog lamps A, B, and C of the same type are selected to verify the effect of the method. The three rear fog lamps A, B, and C are tested at (0, 0), (0, 5), and (5, 0) using the traditional test method and the test method of the present invention, respectively, and the light intensity of the lamps is recorded. The test results are shown in Tables 1 to 3. From the results of the three tables, it can be seen that the traditional method cannot compensate for the error caused by heat accumulation. When the lamp is lit for a long time or baked in an oven at high temperature for a period of time before measuring, its accuracy will be greatly affected, and the maximum error reaches -17%. After using the compensation method of the present invention, the maximum error is -2.8%. It can be shown that when there is heat accumulation in the lamp, the present invention can significantly improve the measurement accuracy and reduce the measurement error.

[0072] Table 1 Test results of rear fog lamp A

[0073]

[0074] Table 2 Test results of rear fog lamp B

[0075]

[0076] Table 3 Test results of rear fog lamp C

[0077]

[0078] In summary, the photometric compensation method for testing the optical performance of lamps of the present invention introduces a photometric attenuation gradient, and finds the most suitable measurement time position by matching a small section of the attenuation gradient of the lamp to be tested with the standard attenuation speed of a qualified lamp. Then, the photometric value of the lamp to be tested at a stable state or at other times is calculated based on the most suitable measurement time position. In this way, on the one hand, the test time can be shortened, the production line test efficiency can be improved, and production requirements can be met; on the other hand, the influence of heat accumulation on the measurement results can be improved, the accuracy of the measurement results can be improved, and other workstations for cooling and dissipating the lamp are no longer needed, which can also save costs. This method can meet the requirements of rapid and rough judgment in the design verification stage and the accuracy of tool optical performance detection.

[0079] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A photometric compensation method for testing the optical performance of a lamp. It is characterized in that The following steps are involved: S1, obtain standard test data data1 of qualified lamps; S2, obtaining actual test data data2 of the lamp to be tested; S3, fitting and aligning the standard test data data1 with the actual test data data2 to obtain a preliminary data position that best matches the actual test data data2 in the standard test data data1; S4, performing position compensation on the preliminary data position to obtain a final data position; S5. Determine the final photometric value of the lamp to be tested according to the final data position; In step S1, standard test data data1 of qualified lamps is obtained, which specifically includes: Continuously measuring the standard photometric data of the qualified lamp until a stable state is reached, and obtaining a standard photometric attenuation change curve of the qualified lamp; Normalizing the standard luminosity attenuation change curve, and calculating standard gradient data of each data point in the standard luminosity attenuation change curve; Using the standard gradient data as the standard test data data1; In step S2, actual test data data2 of the lamp to be tested is obtained, which specifically includes: Continuously measuring the lamp to be tested to obtain a set of actual photometric data, normalizing the actual photometric data, and calculating actual gradient data of each data point in the actual photometric data; Using the actual gradient data as the actual test data data2; The standard luminosity attenuation change curve is normalized, including: Remove the first standard photometric data collected , for the remaining standard photometric data ~ Normalization is performed, and the formula for normalization is as follows: in, Represents normalized data, n is a positive integer, 1<n≤L 1 , L 1 Represents the total number of standard photometric data, that is, a total of L 1 -1 normalized data; Calculate the standard gradient data for the normalized data using the formula: in, Represents the Nth standard gradient data obtained by normalizing the standard data, 1≤N<L 1 -1.

2. The luminosity compensation method according to claim 1, It is characterized in that The qualified lamps are continuously measured until the stable measurement time t 1 At least 30 minutes, measuring interval ∆t 1 Less than 1 second; the continuous measurement time t of the lamp to be tested 2 At least 20 seconds, measuring interval ∆t 2 Measurement interval ∆t with qualified lamps 1 same.

3. The luminosity compensation method according to claim 1, It is characterized in that In step S3, the calculation formula of the preliminary data position is: Among them, Index represents the time position in the standard luminosity attenuation curve. Represents the gradient data change sequence G of the actual photometric data [L1 / 2] ~G L1 The sum of the squares of the differences between the standard gradient data sequence of the corresponding length at position p in the standard photometric data, where p is in the range of 1≤p<L 1 -L 2 +1, L 2 Indicates the total number of data of actual photometric data.

4. The luminosity compensation method as claimed in claim 3, It is characterized in that The calculation formula is: in, represents the actual gradient data, [] represents the rounding operation, represents the p+M-1th standard gradient data obtained by normalizing the data, where The expression is: , where 1≤M<L 2 , Represents actual photometric data The normalized data, , m is a positive integer, 1<m≤L 2 .

5. The luminosity compensation method according to claim 4, It is characterized in that In step S4, the formula for position compensation of the preliminary data position is: Among them, a, b, and c are all constants. Represents the variable introduced by photometric compensation, and its expression is: in, Represents the Index+mth standard photometric data.

6. The luminosity compensation method according to claim 5, It is characterized in that Get the final data location After that, the actual final photometric value at time T is calculated as: in, It indicates the actual photometric value of the lamp under test at time T. Indicates the standard photometric data of qualified lamps at time T, Indicates that the qualified lamp is in the final data position Standard photometric data at It indicates the actual photometric data of the lamp under test obtained from the last measurement in the continuous measurement.

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