MH, HPS & Spectral Distribution

[Dasgoth]

I was looking at the difference between the spectral distribution of the Hortilux-Blue MH and the Hortilux-Super HPS today because that 12/12 is right around the corner.

Heres the .pdf file on both bulbs:
http://www.discount-hydro.com/images...luxBlue400.pdf
http://www.discount-hydro.com/images...ortilux400.pdf
Heres a pic from the back of the two bulbs I have. The MH graph is on the left & the HPS graph on the right:
HPSMHgraph.jpg

We all know that flowering light has more of the red wavelengths that does crazy things to the plants chemistry and promotes flowering, hence the use of a HPS. THe major downfall to the HPS is its lack of lower UV wavelengths. This lack of UV light causes less resin production (o those beautiful Trics). This also explains why people use a combination of MH & HPS in flowering to get awesome buds.

For a minute set aside other factors such as temp, plant genetics, humidity, air quality, CO2 concentrations, wattage of the lamp, pff, par, and such things. Just looking at the two graphs I posted, wouldn't it seem that the MH would be better for flowering since it has the UV wavelengths and more red than the HPS bulb? The stretching of the plant in flowering with a HPS could because they are stretching for the light along with growing to have more flowers sites to ensure a future generation. Hence the longer internode length vs. the shorter internode length when using a MH.

.... Whats your thoughts on the whole MH & HPS spectral distribution thing? I was going to use a HPS with supplemental UVB floros.... Thanks for your time and constructive criticism.

Das

P.s. don't player hate on my crappy borrowed 3.0MP camera

[Dasgoth]

I completely forgot about adding the CMH into the equation. I may pick up two of those bulbs for flowering and add supplemental UVB floros if I feel that is necessary and continue to use MH for vegging. This sounds like my game plan until LED technology improves. LEDs can grow, but I'm not going to make the switch to that system until it has matured a bit more.

CMH Spectral Distribution Graph:
CMHvsHPS.jpg

Das

[Extracurricular]

i think you mean more of a yellow/orange spectrum for the HPS...

as for which is better, Hps def. and ive heard people say that the UVB = resin thing is a myth. just my two cents.

[Dasgoth]

Extra have you read up on the UVB articles? What they have said is with the addition of UVB the plant goes into higher production of THC in the Trics to protect it, hence more THC and resin glands.

[curtropolis420]

Originally Posted by Extracurricular

i think you mean more of a yellow/orange spectrum for the HPS...

as for which is better, Hps def. and ive heard people say that the UVB = resin thing is a myth. just my two cents.

your the biggest idiot ever but thats just my two cents it just produces the fuck out of a protection coating for no fucking reason not for uvb or anything.... fucking moron seriously

[Enuff4All2Share]

I've used an HPS and CFL's alone and with just a 26w UVB bulb, and I believe I saw a difference. I didn't have a microscope for the no-UV grow, but I did for the other and I can confidently say that I have no idea how I could have fit more crystals in there! It was all stalks and balls, on the underside of all the bud leaves... beautiful.

About the MH's giving more red light than the HPS, I may be incorrect, but don't those graphs show how much relative light the bulb gives in a spectrum? Like, isn't the vertical axis of the graph more like a percent and relative only to itself? So the two graphs can't be put side-by-side and show that the one on the left (for example) has more red spectrum. Does my $0.02 make sense?

Enuff