I own an older JVC G-10 unit and currently running an Atlas 500 w Bulb. It has worked fine and shading is not an issue with this bulb, when compared to the JVC original. How much stress on the power supply would occur if I plunked down a 550 Watt bulb in without any adjustments? I really don't want to fry my projector, especially this close to superbowl. I have had problems lighting my 500 watt Atlas at 800 hours. This picture is a bit darker, by in my opinion the blacks are better after a recal with dilard.