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ok im new and i have been reserching and have found PH levels are very important. i dont really understand what PH is first off. whats the difference between dirt and water ph testers, plus i would like to know what i need and exactly what to do with it. please keep in mind im on a budget.

I have just received a T5 Flourescent light system for free and want to know if it was worth using it to grow a little. It has 424" bulbs which are 6500k cool bulbs. could i even get it to bud? if so how well? plus any other tips would be great.