LED or other lamps that remove heat using evaporation of water or other coolant inside a lamp enclosure structure such as a glass bulb typically without the use of external heat sinks or fins Optionally, the pressure inside the enclosure can be reduced to lower the boiling point of the coolant One or more LEDs or other light source can be mounted on a support structure that conducts heat to an evaporation surface A coolant, preferably water or alcohol (or a water/alcohol mixture), is included inside the structure and can be optionally wicked to the evaporation surface Vaporized coolant condenses on the inside surface of the enclosure or bulb transferring heat to the ambient through the enclosure The condensed liquid coolant can return to a pool in the bottom of the enclosure
