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In phosphor-converted light-emitting diodes (pc-LEDs), phosphor heating can lead to decrease of luminous efficiency or even thermal quenching due to local high phosphor temperature. Phosphor scattering model has been used to calculate the phosphor heat generation. Using this model, there are two methods for heating power estimation, one is the subtractive method and the other is the integral method...
High power light emitting diodes (HPLEDs) based semiconductor solid-state lighting has been hailed as the new energy-saving lighting source that can replace the conventional lighting sources due to its high efficiency, long life, environmental protection and compact size. So far, there are a lot of different LED products on the market, including LED bulb, LED spot light, LED landscape lamp, etc. All...
To better understand the reliability problem in high-power light-emitting diodes (LEDs), an online test is critical under an accelerated life test. In this paper, an experimental equipment was proposed for in situ measurement to evaluate the degradation of LED's optical properties. Signals such as illuminance and correlated color temperature were transmitted by the heat-resistant optical cable and...
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