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| There is no high temperature envelope on LED like there is on the quartz lamps in headlights and other applications. So touching the envelope of the LED doesn't cause problems. Heat does cause problems with the sometimes crappy electronics that convert AC to DC and control the current in the diode itself.
In quartz lamps, the envelope is made of quartz, not soda glass, and is intended to operate at a high enough temperature that it will evaporate tungsten that evaporated from the filament and deposited on the interior. That slows the darkening of the envelope for a sometimes longer useful lamp life. Certainly a lamp life with less loss of light intensity. Because of the high operation temperature of the quartz envelope, any skin oil will char and the absorb more heat radiated from the filament and often breaks the quartz. That's why they have to be never touched.
When buying LED lamps its important that they have an FCC approval unless you and your neighbors don't like radio and TV off the air. Some are in the marketplace that make so much noise radio and TV (and probably cell phones) won't work. Reports are that the noisy ones don't have the FCC approval label.
Gerald J. | |
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Cree led light bulbs
