Re: Dville farmer: Northern lights
as long as you buy a digital ballast then you can run both types of bulb in it, so a metal halide bulb will work and so with a high pressure sodium as long as its a digital ballast, the older ballast would only fire one type of bulb but all digital ballasts should fire both,
or go with a dual spectrum bulb and use it for both stages of growth, the 400watt ballast i got was off the auction site and cost me £65 plus i got a free bulb with it and it came with a sunmaster 400watt dual spectrum hps, so ive used that for both stages of growth and its given me great results so far, i need to replace the bulb soon but my results just get better and better so the bulb seems to still be ok,
ive not tried a mh bulb for veg or a hps for flower on their own so cant comment on how they compare, but im more than happy with the results im getting with the dual spec bulb so never bought a mh or hps to even try it.
i think i could of done with a bigger light but thats only because im growing more plants, a 600 watt digital ballast would of been nice but at the time the 400watt was a good price and new so went with that, im sure i could hit bigger yields with the 600watt but then temps would be higher as well.
other growers prefer the dual spec bulb as it gives more of the full spectrum for both stages of growth instead of focussing on the main spectrum for each stage,
also you need 1 ballast per bulb, so if you wanted a 400 watt bulb you need a 400watt ballast or a 600 watt that can be adjusted down to 400 watt, so a 1000watt ballast would fire a 1000watt bulb, ive not seen any setups that have 2 bulbs to one ballast so really not to sure if its possible,
also a decent 400watt ballast will draw 450watts of power, so the cheaper ballasts may just run at 400watt or even slightly lower, this can affect the heat of the bulb and give out a poor spectrum compared with a decent ballast.
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sponsors sell some great products, but you need to factor in the heat as well and what type of hood you want, you could have a sealed hood and have a fan cooling it or an open bat wing type hood, my hood is the open batwing type hood