Incandescent Lamps

Marijuana Horticulture

by Jorge Cervantes

Incandescent lamps were invented by Thomas Edison. Light is produced by sending electricity through the filament, a super fine wire inside the bulb. The filament resists the flow of electricity, heating it to incandescence, causing it to glow and emit light. The incandescent bulbs work on ordinary home current and require no ballast. They come in a wide range of wattages and constructions.

Most incandescent lamps have a spectrum in the far red end, but there are some incandescent grow lamps that have enhanced blue spectrum. They are expensive to operate and produce few lumens-per-watt. They are most efficiently used as a source of rooting medium heat for clones rooting under col fluorescents.