Abstract
In this study, optical and lifetime analyses of commercial light-emitting diode (LED) lamps were carried out with the objective to better understand these characteristics. Lamps of different manufacturers and powers were used: Ourolux of 9 watts, Kian of 9 watts, Black+Decker of 9 watts, FLC of 8 watts, Galaxy of 7 watts and Brilia of 7 watts. These LED lamps remained on by 24 hours/day for 4,291.16 hours. Illuminance measurements were analyzed once a week by each lamp inside the integrating sphere with a sensor of lux meter coupled. Results showed decrease of illuminance by elapsed time, due to the degradation. Results of the illuminance obtained between the initial moment of the experiment and the final one were calculated, revealing degradation of 19% to Ourolux, 20% to FLC, 26% to Black+Decker, 28% to Kian, 29% to Galaxy and 33% to Brilia. This study suggests that the diffusers can have different transmittance values interfering on the illuminance, since the FLC LED lamp presented illuminance with highest values than the other LED lamps tested with similar electrical and optical characteristics. This experiment showed that the nominal power of the LED lamp has no direct relation to the illuminance and, comparing the lifetime, the LED lamp manufactured by Black+Decker was the only one to reach 5,521 hours, that is a lifetime much shorter than the one described at the packages (25,000 hours) for all LED lamps tested
Highlights
Light-emitting diode (LED) lamp is known as a solid-state lighting, because of the LED, that is a semiconductor device invented by Nick Holonyak, Jr. in 19601
The attenuation of light can be attributed to the plastic material of the diffuser, but, comparing the LED lamps with the same power, it was possible to verify that Black+Decker presented superior performance than Kian and Ourolux
FLC LED lamp revealed the highest illuminance compared with all LED lamps tested, showing that the consumed power has no direct relation to the amount of light produced
Summary
Light-emitting diode (LED) lamp is known as a solid-state lighting, because of the LED, that is a semiconductor device invented by Nick Holonyak, Jr. in 19601. This semiconductor electronic component transforms electrical current in visible light with high luminosity. For this reason, it has been very used in low power lamps[2]. Of incandescent and fluorescent lamps, LED ones do not operate at high temperatures, neither use confined gas inside the discharge glass tubes or filament heated to transform electrical energy in light[3,4].
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