All the Lekos we have at my school are older 360Q's. Being as they've been around for a while, I haven't been able to find any markings regarding what type of lenses they have. What can i do to figure this out? Specifically, how would I know what kind of replacement lense to buy for a 360Q that is missing its front lense? Also, I have a 360Q with one 4 1/2 " lense and a 1000w bulb, is that normal?