If your tight on your budget you could go flowering with a MH bulb as latewood said without any problem (I strongly suggest a warm bulb or any bulb with enhanced red spectrum if you plan on flowering with it). However, if you can afford a conversion bulb (You can buy a HPS conversion bulb that fits your MH ballast) or HPS ballast then id suggest you buy both MH for Vegetative Cycle & HPS for Flowering Cycle

Have a nice Grow!
mafia819 Reviewed by mafia819 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