They have them at the gym where I train, so we get to use them for free. The dude who owns the gym has two beds and one has 15 minute bulbs and the other has 10 minute bulbs. One of the 15 minute bulbs burnt out so he replaced it with a 10 minute bulb. The first time I ever got in it, I had a line down my body where the 10 minute bulb was and it burned peeled in a line down my body. I thought it was pretty focked up.