How important is it to stick to factory specs when considering lamps to purchase for my ERS's? All of my ERS's are throwing from a distance of about 20 to 30 feet...so I figure that I will find a lamp that will suit them all....rather than have eight different typs of lamps. I'm really having trouble getting a nice smooth wash. I see that some of the instruments can share common lamps from specs provided by ETC/Altman/etc... but I'm not happy with their output. I realize that FEL's may end up being the death of my instruments...as they get so blummin hot...what do you think???