hi yall i was wondering what brand of bulb and type you are using in your system. the length of use hrs ect. i have a 1000 watt switchable ballast that came with a hps bulb and am just starting a new grow.should i get a mh bulb and switch to hps when i go 12/12 or get an argosun MH type multispectrum bulb for the whole grow. if i do switch bulbs at flowering do you change the bulb on the same day as the light hours change? do any of you buy your bulbs online and if so what stores do you find the best prices? thanks for any and all replies