These bulbs will burn out. Literally. they explode! Not sure at all! Out of 4 packs 2 bulbs broke and that's only one month! I just looked at the lifespan on the box and right on the box it says 0.9 years. Even if they don't detonate within a month (putting my house and life on the line), 9 years is a very short lifespan. At least not recommended. GE should take care of this situation and at least refund the people who bought them.