Last night we had a short power cut whilst using our Sony HS20 - when the power came back up after 5 or 10 seconds, the fans ran and the lamp/cover warning light was flashing. Shortly afterwards the projector powered up OK and has been fine starting with no repeated lamp warnings. My concern is that repeated or longer power cuts will cause internal overheating to damage the lamp and associated components due to lack of fan over-run. My question is whether it is worth getting a computer type UPS for use with the projector? Has anyone tried this? I understand that a UPS will constantly provide a psuedo stepped mains waveform rich in harmonics. Will this result in any adverse projector effects? Thanks, Mark.