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To: unclewest who wrote (1768)	2/3/2000 5:23:00 PM
From: freeus	Read Replies (1) \| Respond to of 10713

All light bulbs within ten years! Light without heat! How little I knew. This is going to be a biggie if that comes to pass. ( Of course if the bulbs last too long so they don't have to be replaced....oh well, that's a concern for a later time.)

To: unclewest who wrote (1768)	2/3/2000 6:48:00 PM
From: mauser96	Read Replies (2) \| Respond to of 10713

Why are blue LED are important in getting the most often desired end product of a "white" light? There are 2 possible answers, though so far I can't find much published on the subject. 1) Blue LED can be used in combination with other color LED to produce white light 2) Blue LED can be used to stimulate a phosphor which in turn produces white light. This is somewhat similar to the process used inside a fluorescent light bulb .. The blue color is important because Planck discovered that the energy of a light quantum increases with frequency, and blue is higher frequency than red. (Higher frequency means shorter wavelength). Thus a blue LED should be more efficient at stimulating phosphors to produce white light than would be a red or other color LED. This probably is how the white colored LED flashlights work, because examining them with a magnifier indicates presence of a white colored shield not present in the blue color LED flashlight.