CFL bulbs (lamps) - CMH bulbs - HPS bulbs - MH bulbs (lamps)
CMH (ceramic metal halide - also LEC or CMD) bulbs are suitable for plants in the vegetative and flowering phase. CMH lamps produce the most sun-like spectrum of light.
HPS (High Pressure Sodium) bulbs are suitable for plants in the vegetative and flowering phase. HPS Lights emit white light.
MH bulbs are especially suitable for the plant vegetative phase.