I've been using fluorescent bulbs for a long time now because incadescent bulbs put off so much heat. I had one over my kitchen sink that lasted over 10 years. I put them in my bathroom fixture that uses 3-4 bulbs. First time I got the ones that were equal to 100 watt and it almost blinded me when I flipped the light switch on. Had to back off that - mixed some 40 watts with 100 watts. I have the equivalent of 4/100 watts in my sewing room. I like 'em.