The Cooltube allows to directly extract the heat from the bulb and thus reduce and maintain the temperature of the grow room more stable. The coated reflector will reflect light onto a regular 8-sided reflector that attaches to the top of the Cooltube shaped like bat wings. It also allows the light to be brought closer to the plants by not giving off so much heat.
To keep the tube cold, the Cooltube must be accompanied by a good extractor with sufficient air evacuation.