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Old 05-21-2012, 11:06 AM   #146
azazel1024
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Posts: 182
Karma: 346596
Join Date: Jan 2012
Location: Ellicott City, MD
Device: Nook simple touch, iPad 2
Yup as mentioned the Infrared LEDs use a lot less power. I've seen IR LEDs that use on the order of microwatts of power per LED. If I had to wager a guess the total power budget of the entire infrared touch screen, both emitters, receptors and the signal processor probably is less than 10 miliwatts total. If I were to take a guess as to the total power budget of the glowlight LEDs, it is probably in the range of 50-200mw between minimum and maximum brightness (LED dimming also is not a linear change in terms of power consumption reduction and brightness level, an LED outputting 20% of its maximum luminance might be consuming only 30-50% of the power at maximum instead of 20%).
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