It will work just fine...also,..do not crowd plants. 4 plants will grow decent under a 400.... good luck
They'll be more stretchy? Nahhh.. Big negatory.. Not in my case anyways... I have bushes. In fact, I had to raise my light several feet in order to get some damn vertical heighth going on. Take a look for yourself.The plants will be more stretchy, but they will grow just as well with the HPS bulb as the MH. It's not useless to have a MH, but it's not ideal for young plants and clones... so most people go with fluorescents if they choose something other than HPS for veg. Hope that helps, good luck!
Unecessary.MH unnecessary for first period flowering or not???
or can i use AGRO HPS 400w ???