Ok these bulbs are hard to find and yes they work. Although the lamp packaging and label say it is a 3 band, 100-200-300, it actually only works with two settings and I'm not sure if they are actually not the same. There is very little noticeable difference between them. I bought this bulb as a backup, my old one is still at position 3 and there is a noticeable difference between each setting. So yes, it's nice to find this type of bulb, but I don't think it was worth the money I paid for it.