Metal Halide....

AND ... AND.....

my HPS buds are just as crystally...

I use this bulb sometimes. For veg. always and a few week in flower.

http://www.hydroponics.net/i/131469 $77.95 400 watt mh conversion

GypsyBush said:

My MH produces just as much of the same density and size nugs as my HPS...

Click to expand...

It's an almost negligible difference if grown correctly, but alas, MH can maximally achieve 90-95% of what HPS will when both are used properly in flowering.

The quality of light from MH surpasses HPS, the intensity of HPS far surpasses MH.

I hear you... I've read that before too... and I appreciate you sharing the good info you have...

I am sure if we were in a lab, I would be amazed at how much difference there really is...

But for all of MY practical purposes, the only differences I can see are a bit more leaf and way better pics...

I am not trying to demean your info... not at all... and I appreciate you taking the time...

So, in my opinion, flowering with a MH is just fine... although HPS is still preferred by most...

I completely agree flowering with MH is fine, in fact mixing them together(MH+HPS) produces, by far, the best results. Even the sun can not match a high powered(CO2 doping helps) indoor grow.

Awesome thread...fantastic questions...so here is my question.

I have been vegging for 6 weeks under a 400w MH and it's officially time to flower. I have read a lot about the different lights and have heard on many occasions that MH produces a better smoke and HPS produces better yield. Knowing that I was going to be using both...first 2 weeks of flowering with the MH and then 5 weeks of flowering with HPS and then finishing off the grow with another 1-2 weeks of MH. Is this advised or is that a bad idea?

I am not sure what throwing different spectrums at a plant will do...

I know that the plant can tell the difference...

But I am not sure if you would be stressing it or not...

But I can only imagine she will be confused to have "summer light" at the end of it's life, which, theoretically would happen in the fall, with the "warmer" light...

But I really dunno...

I run a 400w hps light and a 400w mh light for my flowering room. I can honestly say that my buds are higher quality since I switched one of my hps lamps to mh. But I would never flower without an hps lamp.

MH and fluorescent output are quite similar, if you don't have two ballasts to run HPS&MH together, consider HPS with ~6500k fluoros(T5/T8 as side lighting, for instance). Using them as side lighting reduces the distance the light must travel to effectively cover the entire plant by half, which is an effective difference of 4 times(inverse square decay). So this is very efficient use of fluoro lights, and minimally interferes with the over-head HID.