Lights that are air-cooled (Figure 5.12)
tend to last longer and do not heat up your
grow area that much. Most expert growers like
to keep a room at a stable controllable
temperature and use these air-cooled lights to
achieve that. If your light is not air-cooled
then you will have to build an air vent and fan
in your grow room wall to keep the temperatures
under control. Cannabis leaves will burn if
placed too close to a HID light.
Figure 5.13 - This is a water-cooled light system.
These inventions have been around for awhile but have
not caught on that much because they require a good
bit of work. A constant pump of cool water must be
circulated into and out of the light system.
