Voltage

How big is the space you are planning to grow in? This should be the deciding factor for lighting. Aim for 50 wats per square foot at least.
 
you are asking the wrong question. you want to know WATTAGE not VOLTAGE. u take whatever voltage ur receptocle tells you (usually 120V in US). and he more wattage the better. i currently have 200 watts for two plants. check out my grow journal in my sig.
 
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