We use them "outside" and the outside is an Airport. They're much brighter and crisper than the old bulbs BUT they don't get warm. If/when is snows they easily get snow covered and that is a big problem. if we have an LED airfield sign, and the sign face faces the wind during a snow, the snow will cover the sign face and that's a problem. They do save energy but we sometimes get complaints that they are 'too bright,." even when they are turned down to the lowest step.