A 100 watt lamp is probaly frying them! I use a 75 watt on my scorpion and I have to dim it down about half way! You need a digital thermometer with a probe to properly measure temps! You will be surprised on the difference from what it is to what you thought! I thought my temps where good until I used a digital and my temps were abut 100 on the warm side. You can also use the digital thermometer in you rack in the future so it won't be wasted money!