Danielsgb
Well-Known Member
OK, well a 250W or 400W CMH use a HPS ballast ANSI S50/M168/O and S51/M169 where 150W CMH uses a Pulse Start MH ballast ANSI M142/E, M102/E.Thanks for the links, really like your grows man. Still reading through, but do you use the PSMH for veg/flower/both? And how does it compare to other lights? Do you think a 150 CMH would be enough for a 24x28x48 (lwh) box, probably have 4 small plants in there and LST them. Debating getting a 250 instead for that space, but I've already got a 150 so would rather use that if practical. Also, do you think a 400 would be adequate for a 34x44x76 closet thats mostly veggies and herbs with only a couple of seedlings there in veg towards the end of flower in the grow box? I'm renting so can't put any holes in the walls to vent the closet so probably won't be closing it up.
So I use the same bulb all the way through.
A 400W HPS is usually a S51 ballast. It is all the same CMH spectrum. They do have a 4000 Kelvin or 3000 Kelvin so the 4k would be better for flowering. Doesn't matter much to me.
I think a 250W would be better for that space than a 150W. Plus the penetration is better.
A 400W is great for a 3' x 3' if you can deal with the temps, but even another 250W would work since your renting.
Hope those threads are helpful. This one is the build journal. A Medicinal Refridgerator
Daniels