I knew these bulbs were dangerous because they contain mercury. They have been linked to health problems in some individuals (headaches, rashes etc.). We have a tv show here in Ontario called 16 x 9 & they did a whole show on these bulbs & told us how problematic & unsafe they can be. Be VERY careful when disposing of them especially if one breaks !! It's like everything else that our Government gets involved with - first, they tell you they are better & then 10 years down the road, they take them off the market because they are dangerous to our health !! Go figure.