The Solar Glo comes in 125 watt and 160 watt. I was wondering why the smaller one is 125 when most of the others offer a 100 watt and went to their website to read this ... "Exo Terra refrained from developing lower wattages as lower wattages simply do not generate enough heat for these self-ballasted bulbs to work properly, making them unstable and unreliable". I tried to find a warranty but no luck. The bulb itself looks similar to the Power Sun with the smooth surface where the other MVB's have the heavier spot light lens. For the price, I'll try one, I wanted a spare to bring to work. After I let it burn in, I'll compare temps and see how it compares.