High Pressure Sodium (HPS) Lamps - are the most commonly used lamps in the greenhouse. The spectral emission leans toward the red. HPS lamps have a longer life expectancy than Metal Halide lamps and maintain a high lumen level longer.

Metal Halide (MH) Lamps - are used for thick lush vegetative growth and are used in growth chambers or areas where no sunlight is available. The spectral emission leans toward the blue.

MS-Metal Halide Lamps - are used as the above MH lamps but must be used in the horizontal position. These bulbs provide more Lumens than conventional MH lamps but may only be used in a system designed to take a MS bulb. This bulb has a tab on the base to fit those designated systems.

Conversion (HPS) Lamps - are meant to be used with a metal halide ballast to provide the High Pressure Sodium spectrum. The NH360 works in a 400 MH ballast and the NH940 operates in the 1000 MH ballast. Sodium to Halide conversions are used in sodium ballasts.

Double Ended Bulbs - high red and blue spectral ratios give optimal photosynthesis efficiency. Tubular low profile design for compact fixtures and great lumen lumen output for high PAR values.