Maybe one of the docs here can help us out on that one.

I don't think so. A pupil will react with very little light. Its the speed of pupil reaction thats determined buy light brightness.
It only takes a second to read a pupils reaction.

That being said a 10 million candle watt search light is not used for pupils haha.

I would think a photon light is fine, you can adjust the intensity with various distances away from the eye.
As always there is some common sense involved here.

One of the medics or docs can confirm this or set me straight.

Mike