Influence of temperature in the performance of the LED lamp

Santos, Emerson Roberto; Burini, Elvo Calixto; Hui, Wang S.

doi:10.17563/rbav.v39i2.1171

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…As this experiment used only one LED lamp from each company, the results obtained represent low precision, but, in general terms, it was possible to verify the degradation of illuminance by elapsed time for all LED lamps tested. The hypothesis to decrease the performance can be attributed to the intern high temperature reached by the semiconductor electronic components inside the body of the lamp and high temperature of LEDs operation inside the diffuser 19 . Then, it is suggested to maintain the temperature stable and below of maximum operation temperature pre-established to the semiconductor electronic components (LEDs, diodes, resistors, integrated circuits, and electrolytic capacitors, mainly) used to the composition of the LED lamp.…”

Section: Resultsmentioning

confidence: 99%

Lifetime and optical analyses of LED lamps

Santos

Furuya

Burini

2021

RBAV

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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

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Section: Resultsmentioning

confidence: 99%

Lifetime and optical analyses of LED lamps

Santos

Furuya

Burini

2021

RBAV

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“…Another very frequent problem observed for LED lamps is related to the appearance of dark spots on the LED device surfaces that are caused by high temperature, ≈ 130ºC, with usage time 15 . The LED devices of lamps are connected electrically in series on the metallic board (used as heat sink).…”

Section: Dark Spot On the Phosphor Layermentioning

confidence: 99%

Temperature analysis of driver and optical behavior of LED lamps

Santos

Tavares

Duarte

et al. 2021

RBAV

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This exploratory study was carried out with the objective to know the optical behavior of light-emitting diode (LED) lamps used and the temperature reached by electronic components that compose the driver (electronic circuit situated inside the body LED lamp) responsible to convert electrical alternating current from power line to direct current to operate the LED devices. Then, two different experiments were carried out with LED lamps. In the first experiment, 131 LED lamps used were chosen randomly and bought from household appliances store (bargain market product) presenting different nominal powers, 8, 10, 12 and 15 watts. All LED lamps were polarized at the power line at 127 V and revealed different optical behaviors, such as: not turn-on; flashing light (as strobe effect); flashing light (as strobe effect) with high intensity (more intense than normal); flashing light (as strobe effect) with low intensity (less intense than normal); fast turnon and turn-off only; and turn-on with low intensity of light (less intense than normal). The hypothesis for these behaviors can be attributed by three different behaviors: in lamps not turn-on, this failure can be attributed for dark spots that are created on the surface of LED device. In these lamps, all LED devices are electrically connected in serial. When a LED is inoperative, the electrical current is interrupted for all LED devices; damage to the electronic components caused by internal high temperature confined inside the lamp body during the operation causing electrical oscillations, as observed from different behaviors from flashing light, flashing light with high intensity, flashing light with low intensity and fast turn-on and turn-off only; swelling of the electrolytic capacitors causing low energy storage and varying the electrical current flow, the electrical current for other electronic components altered the normal optical behavior of the LED lamps. In the second experiment, the temperatures of electronic components located in driver were obtained out of body lamp revealing: from 33 (lowest temperature attributed to inductor) to 52.5ºC (highest temperature attributed to electrolytic capacitor). These temperature values represent the ideal or normal condition of operation for electronic components, but, when they are operating inside the lamp body, the found temperature values increased considerably. This characteristic can be better evidenced by strong color change (caused by accumulative temperature during the elapsed days used) on the printed circuit board used in the driver.

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Influence of temperature in the performance of the LED lamp

Cited by 2 publications

References 4 publications

Lifetime and optical analyses of LED lamps

Lifetime and optical analyses of LED lamps

Temperature analysis of driver and optical behavior of LED lamps

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