Well it seems to be my time with PJ issues. Just discovered, after I thought the new lamp I put in had no real brightening effect, that it is a PK-L2210UP instead of a PK-L2210U. The sight I bought it from stated it was the replacement for the RS55, and although I checked the manual to confirm, I thought the 'P' was of not consequence. However, the PK-L2210UP is 275W, and the other 285W. I'm sure they will not take it back after 7hrs of use. If anyone is interested in the 'P' lamp, will sell for 50% of what I just payed. PM me.