IR laser detector alarm
With the new Infrared laser pointers etc. there is no way to tell if light is on or not. I think there is a need for a IR laser light detector that is small enough to fit in your pocket and could be clipped to your shirt. If a IR laser was pointed in your direction the sensor would chirp or make a noise.
I've noticed several places selling IR laser pointers. I think they are dangerous and very little use for them, since they are invisible.
Anybody want to make one? If you do I want one.