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De-ionized water has the exact same minerals that runs through your tap water, all it does is change the alkalinity/acidity of your water. EX: if your tap water reads 7.5 pH you can use an ionizer to lower it. Basically its useless for growing, thats why we have pH down/pH up. Stick with...

To replicate the sun: If your plants have a wider range of kelvin then they can fully mature, being at their full potential. The sun itself isnt only 2500 kelvin, like your HPS light. If he would throw in some 6500k cfls and even some warmer ones then hes giving his plants a wider spectrum =...

A lower kelvin like those 3000k bulbs are more suited for flowering, you want to have as close to 6500k as possible for veg. If your going with those fluorescents and you dont see the indication of kelvin then choose the "cool white" color. They are usually 5500k+