Obtained to calculate the radiation rate of the base, Toshiba Lighting 7.2W product is about 0.37, the Samsung LED 7.1W product of about 0.6, the ground on the optical 7.5W product of about 0.64. Radiation means poor is not easy from the base to the external cooling of the material. Samsung LED and ground photoelectric base with heat sink, aluminum die casting manufacturing, Toshiba Lighting and Technology base is made of thin aluminum manufacturing. Toshiba Lighting alumite surface treatment to improve the radiation rate, but in our measurement, the value is still lower than other companies.
Even the base of the surface temperature reaches 61 ℃ or so, "the actual use of absolutely no problem" (Toshiba Lighting and Technology). LED bulbs by the manufacturer of the base temperature is determined according to the independent standard. "Even if the surface temperature is slightly higher, if they can ensure that the LED chip junction temperature below a certain value will not affect the luminous efficiency and life" (LED bulb manufacturers and technical staff). On the contrary, in terms of the design of the more important as far as possible, allow the surface temperature, thus maximizing the simplified cooling bodies (the technicians). In other words, the thermal design, the performance of the overseas manufacturers also slightly to leave room. Dismantling, first measured the temperature of the LED bulbs in the lighting state (Figure 2, Figure 3). The purpose is to confirm the existence of a significant difference in appearance of the base (he at Ministry) whether the differences will be reflected in the temperature. LED light rarely contain infrared components of the shade portion of the lights and not too hot. But the base is the thermal part of the LED chip, so the temperature is high. This, in that the base will become the hottest part (near the installation location of the LED) to paste the radiation rate of 0.95 of the tape, the use of thermal imager measuring the temperature of the tape.
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