For me, it's all about keeping the heat to a minimum. I buy the warm whites from Cointakers, and I put them behind the backglass, under all the playfield inserts, and under most of the playfield plastics--anywhere heat is going to do damage. I don't put them in the pop bumpers (unless the cap is something really rare that isn't reproduced) because they just don't look right in them.
The warm whites from Cointakers are pretty close to 44/47's, not quite, but miles ahead of the cheaper LED bulbs. I bought some of the cheap ones off ebay and they're garbage.
Sorry, but I like to keep my machines turned on, and this way I can do it without worrying about my inserts sagging, my backglass peeling and my plastics warping from the heat. The peace of mind is worth the slightly different appearance the LED's give the machine.
