Quote:
Originally Posted by dwig
Halogen lights emit more IR than visible light, as do conventional tungsten lamps. This is not the case with LED and fluorescent lamps, which is why they are more efficient, producing more visible light and less waste IR per watt consumed.
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The touch screen does not work at all in the coffee shop. Their lights are very bright, and maybe they are actually tungsten light. They certainly are not fluoro, LED or regular incandescent lights.