Tungsten Halogen Lamps

Marijuana Horticulture

by Jorge Cervantes

The tungsten halogen lamp is a poor grow light. It was originally called Iodine Quartz lamp. The outer tube is made of heat-resistant quartz. the main gas inside the quartz tube was iodine, one of the five halogens. Today, Bromine is used most often in the lamps. Similar to incandescent lamps, they use a tungsten wire filament and a sealed bub are are very expensive to operate.

Their lumen-per-watt output is very low. They run on a household current and require no ballast. Tungsten bulbs are inefficient to operate as are the incandescent lamps. Their color spectrum is in the far-red end with 10-15 percent in the visible spectrum.