Originally Posted by
Jbudwise
So if I understand your question, you want to know exactly what wattage to run your light at based on the growth stage of the plant. Basically, you don't want to be wasting 200W on a 4-day old seedling.
A tough question to answer; however, I can tell you a useful way to check. It would help if you had a luminometer, also called a lux meter, cheap on eBay. These can measure the light intensity from your grow light. During veg you need a minimum of 20000 lux, maxing out at 50000. While in flower you need a min of 40000 max at 80000. while seedlings and clones only need around 4000
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