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Actually, iPad chargers are 2.1 A. I use it and there's no problem.
The best thing about using an Arduino is that you can control the voltage via I2C, SPI, etc. using other controller.
I'll make this project when I have individually addressable LEDs and my Orange Pi (I will hopefully receive it next week). BTW, you should have soldered the strips before pasting them on your TV.
See this: https://en.wikipedia.org/wiki/Thermographic_camera#Uncooled_infrared_detectors. And thermal imaging at ambient temperature is on the IR spectrum, but the wavelength is longer than a normal camera can image (between 3000 and 14000 nm).
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