I highly doubt the iPhone will be able to compete with the flux density of sunlight, at any wavelength, which we generally regard as safe. (1400 watts / m^2) *

I highly doubt the iPhone will be able to compete with the flux density of sunlight, at any wavelength, which we generally regard as safe. (1400 watts / m^2) * 0.2 [ground albedo] * 0.5 [proportion in infrared] = 14 mW / cm^2 of infrared radiation looking at the ground on a sunny day. (14 mW / cm^2) * 1 square foot [approx size of a face] = 13 watts I'm going to guess there isn't a 13 watt infrared laser in the iPhone, or we'll be seeing some great hacks where people take the lens out and start setting things on fire from hundreds of feet away.