MH Light with Autos?

Do you use a MH bulb for autos until flowering starts, or do you use HPS all the way from start to finish?

Either will work....MH will keep the nodes closer than HPS for vegg stage. Most usually do switch to HPS for flowering, but you will get near the same results with MH all the way from seedling to harvest. HPS light during flowering usually keeps the bud structure more compact than MH from the little bit of experience I have with MH lighting. Plus the same wattage HPS bulb is gonna be more lumens than the same wattage MH.


I myself just use a enhanced spectrum HPS bulb after sprouting the seeds under fluorescent for a couple weeks. It gives you 30% more blue spectrum than a normal HPS bulb, so it's the best of both worlds in one bulb really.

what brand bulb? where online can you find it?

I'm using Lumatek bulbs now because I have Lumatek digital ballasts and they are specially designed for digital, but in the past with old school magnetic ballasts, I used AgroMax or Hortilux. Both are top of the line and have high PAR (Photosynthetic Active Radiation) output to grow big beautiful plants. Just search Agromax or Hortilux on Amazon and then type what wattage you are looking for.