Hello all. I'm the lighting guy for my church. I'm a volunteer, not staff. One of my biggest headaches is trying to get the equipment we need. To this end, I'm trying to work up how many spare bulbs we should have on hand, per quarter or per year. So I guess I need to know the lifespan of a few things: Par64 1kW WFL Par56 500W WFL 575W Ellipsoidal 1kW Fresnel Mac 600 Coemar ProSpot 250 LX Sorry, I'm not sure what specific bulb goes in the Mac's or the Coemar's. Reason is, I've never changed them! We have 2 Mac 600's, purchased used in March of this year. They came with bulbs in them, I have no idea how many hours were on them before they got to us. The Coemar's have been in service for over 3 years without a bulb change! So can anyone give me a ballpark figure for the lifespan of these bulbs? Thanks!