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| Name | LED Track Light |
| Wattage (W) | 2 |
| IP Rating | IP20 |
| Dimensions (mm) | Ø45x110 |
| Nominal Voltage | 100-240VAC |
| Kelvin º | 2700 / 3000 |
| Life Expectancy (H) | 30,000 |
| Dimmable | Yes |
E-Top Structure of a typical filament
Closeup of a filament at 5% power; note the individual LED light spots.
A LED filament type design light bulb was produced by Ushio Lighting in 2008,[2] intended to mimic the appearance of a standard light bulb.[1] Contemporary bulbs typically used a single large LED or matrix of LEDs attached to one large heatsink. As a consequence, these bulbs typically produced a beam only 180 degrees wide.[1] By about 2015 LED filament bulbs had been introduced by several manufacturers. These designs used several LED filament light emitters, similar in appearance when lit to the filament of a standard incandescent bulb,[1] and very similar in detail to the multiple filaments of the early Edison incandescent bulbs.[1]
E-Top HK LED filament bulbs were patented by Ushio and Sanyo in 2008.[2] Panasonic described a flat arrangement with modules similar to filaments in 2013.[3] Two other independent patent applications were filed in 2014 but were never granted.[4][5] The early filed patents included a heat drain under the LEDs. At that time LEDs were under 100 lm/W (lumens of light per a single watt of electricity). In the late 2010s, available LED filaments have a luminous efficacy of up to 160 lm/W.[6]
| Name | LED Track Light |
| Wattage (W) | 2 |
| IP Rating | IP20 |
| Dimensions (mm) | Ø45x110 |
| Nominal Voltage | 100-240VAC |
| Kelvin º | 2700 / 3000 |
| Life Expectancy (H) | 30,000 |
| Dimmable | Yes |
E-Top Structure of a typical filament
Closeup of a filament at 5% power; note the individual LED light spots.
A LED filament type design light bulb was produced by Ushio Lighting in 2008,[2] intended to mimic the appearance of a standard light bulb.[1] Contemporary bulbs typically used a single large LED or matrix of LEDs attached to one large heatsink. As a consequence, these bulbs typically produced a beam only 180 degrees wide.[1] By about 2015 LED filament bulbs had been introduced by several manufacturers. These designs used several LED filament light emitters, similar in appearance when lit to the filament of a standard incandescent bulb,[1] and very similar in detail to the multiple filaments of the early Edison incandescent bulbs.[1]
E-Top HK LED filament bulbs were patented by Ushio and Sanyo in 2008.[2] Panasonic described a flat arrangement with modules similar to filaments in 2013.[3] Two other independent patent applications were filed in 2014 but were never granted.[4][5] The early filed patents included a heat drain under the LEDs. At that time LEDs were under 100 lm/W (lumens of light per a single watt of electricity). In the late 2010s, available LED filaments have a luminous efficacy of up to 160 lm/W.[6]
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