Metal Halide for vegatative growth and High Pressure Sodium for Flowering. MH emits light in the blue and green spectrum and HS emits light in the red and orange spectrum.
Trichome Creator Reviewed by Trichome Creator on . ~Bulb Question~ This is my understanding.In the beginning of a grow you start with MH bulbs.When you start to flower you change to HPS Bulbs.However the bulb sitting in my lap says,"SunMaster Neutral Delux Metal Halide,1000 watts and 105,000 lumens.The box says it may also be used for flowering and vegetation. :confused: So do I switch bulbs at different stages?How many such lights would a 10 foot by 10 foot room require? Thanks... Blessings Starr :rasta: Rating: 5