Set the projector up high so he can't reach or look into it. Looking into any bright light for very long times can damage the macula. Very brief looks are unlikely to be a cuase for concern.
JCH MD
Thanks for the reply. Just wondering, how long would it take to cause damage? Would it make a difference whether it was a Halogen bulb or a Regular bulb?
The more intense the light (halogen or xenon) the greater the risk.
Generally you would be talking about staring into a light source like this for 10-30 or more minutes
JCH MD