Air Cooled Lamp Fixtures

Several air-cooled lights are available. Some use a reflective hood with a protective glass face and two squirrel cage blowers to move air through the sealed reflective hood cavity. The air is forced to travel around comers, which requires a higher velocity ol airflow. Other air-cooled reflectors have no airflow turns, so the air is evacuated quickly and efficiently.

In this experimental system, a hooclless HID trawls up and down vertically between tiered tubes of budding females. Growers are trying every possible means to grow more in less space and get the highest yield per watt
The Cage from Tl tC HC,S in Vancouver, BC is one of the most productive gardens per square foot (mJ).

Water-Cooled Lamp Fixtures

Water-cooled and air-cooled lamp fixtures are somewhat popular in hot climates. These lamps run cooler and can be moved closer to plants. Water-cooled bulbs are difficult for thermal imaging equipment to detect. Air-cooled fixtures are inexpensive to operate and easy to set up. Keep outer jacket clean and avoid scratching.

Growers decrease bulb heat by 80 percent with a properly set up water-cooled bulb. The water and outer jacket account for a ten percent lumen loss. Growers make up for the loss by moving bulbs closer to plants. On an average day, a 1000-watt bulb uses about 100 gallons of water to keep cool, if the water runs to waste To recirculate the water requires a big, big reservoir. The water in the reservoir that serves a recirculating cooling system must also be cooled. Reservoir coolers can easily cost $1000.

No Reflective Hood

One option is to remove the reflective hood. With no hood, the lamp burns cooler and emits only direct light.

Growing Soilless

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