Led-Based Light Bulb

Abstract

A light source (10) comprises a light engine (16), a base (24), a power conversion circuit (30) and an enclosure (22). The light engine (16) comprises at least one LED (12) disposed on a platform (14). The platform (14) is adapted to directly mate with the base (24) which a standard incandescent bulb light base. Phosphor (44) receives the light generated by the at least one LED (12) and converts it to visible light. The enclosure (22) has a shape of a standard incandescent lamp.

Description

BACKGROUND [0001] The present application relates to the art of LED lighting systems. It finds particular application in the light packages traditionally employed in an incandescent light source and will be described with particular reference thereto. Those skilled in the art will appreciate the applicability of the present invention to the applications where a use of an LED light source in a traditional bulb light package can provide advantages such as increased durability, light output stability and energy savings. [0002] Typically, incandescent light bulb packages utilize a light source that includes an incandescent filament within a glass enclosure. However, the incandescent filaments are fragile and tend to gradually degrade during lifetime of a bulb causing the useful light output generated by the filaments to decrease over time. The increasing fragility of the filament with age eventually leads to breakage. Typical incandescent light bulbs have a mean life of 500 to 4,000 hou...

AI Technical Summary

Benefits of technology

[0008] Another advantage resides in providing an adaptable and scalable LED lamp design.

[0006] According to one aspect of the application, a light source is disclosed A light engine generates light of one of a plurality of wavelengths. The light engine includes a platform and at least one LED disposed on the platform. An enclosure surrounds a light generating area of the light engine. A base includes a heat sink for conducting thermal energy away from the at least one LED. The light engine is mounted onto a heat sink. A conversion circuit supplies electric power to the light engine.

Problems solved by technology

However, the incandescent filaments are fragile and tend to gradually degrade during lifetime of a bulb causing the useful light output generated by the filaments to decrease over time.

The increasing fragility of the filament with age eventually leads to breakage.

A widespread use of the LED lighting systems have been limited because the consumers are accustomed to seeing and purchasing the traditional bulb lights.

However, the single LED does not produce the light output of the same optical characteristics as each existing incandescent bulb lamp.

In addition, the LEDs emit highly directional light resulting in a narrow light angle and require different input power.

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