Having purchased a house and light bracket for my two tortoises last year, l wanted another heat light Thought l could use a clip on lamp. Which was fine, until either me or one of my grandchildren moved the lamp slightly, but enough to burn the wood! next thing l could smell burning! the lamp had started to burn the housing unit! Thankfully l noticed before anything serious happened. Spoke to Ken who agreed they were dangerous and l purchased another lamp from him. Many Thanks Ken, next day delivery too!! Brilliant service. Please be very careful if you have one of these clamp lamps! they are far too dangerous to use on the tortoise housing units. Just loving our Pebbles and Peachy that we purchased last Autumn, Highly recommend!