Hps/mh

I know vegging is said to be done under the mh but i have also herd that vegging can be done under hps as well (i know most ppl flower w this). my question is there any pro/cons to vegging with a hps bulb? I hear it may speed up growth but promotes stretching, will this alter yield or anything (or even right?)? Ive herd of people doing hps veg but arent sure as to if its widely practiced and if the benefits out mass the cons.

I wouldnt even try vegging with hps. Red spectrum promotes flowering.

it can be done but i wouldn't suggest it. i believe the key to a big yield is vegging them fat, that won't happen under hps light.

thanks alot guys ill stick to the mh until i begin to flower, unless someone can give me a good argument, but it seems as if yall know what ur talking about

jester1989 said:

I wouldnt even try vegging with hps. Red spectrum promotes flowering.

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Actually dark period does. Not getting very detailed but at night your plants develop hormones with the proper dark period they will develop enough hormones to flower.
Not sure if there actually called "hormones" but you get the picture, i hope

MH is the best for veg but what is most important is the spectrum for growth.
During the Vegetative state plants need more Blue spectrum hence Metal Halides. Blue Spectrum CFL's and Fluoros would do the trick too but MH is best.
During the Flowering state plants need more Red spectrum hence High Pressure Sodium. Red Spectrum CFL's and Fluoros would do the trick too but HPS is best.

Now MH and HPS are HID (High Intensity Discharge) so you will to have deal with the heat, this is the more expensive but more rewarding option.
CFL (Compact Fluorescent Lighting) using the designated color are also reasonable if you would like to keep cost/heat down. Used for smaller personal operations.

Also MH (Blue Spectrum) along with HPS (Red Spectrum) during flowering is thought to produce more resin, many old timers live by that.

Tagh said:

Actually dark period does. Not getting very detailed but at night your plants develop hormones with the proper dark period they will develop enough hormones to flower.
Not sure if there actually called "hormones" but you get the picture, i hope

MH is the best for veg but what is most important is the spectrum for growth.
During the Vegetative state plants need more Blue spectrum hence Metal Halides. Blue Spectrum CFL's and Fluoros would do the trick too but MH is best.
During the Flowering state plants need more Red spectrum hence High Pressure Sodium. Red Spectrum CFL's and Fluoros would do the trick too but MH is best.

Now MH and HPS and HID (High Intensity Discharge) so you will to deal with the heat, this is the more expensive but more rewarding option.
CFL (Compact Fluorescent Lighting) using the designated color are also reasonable if you would like to keep cost/heat down. Used for smaller personal operations.

Also MH along with HPS during flowering is thought to produce more resin, many old timers live by that.

Click to expand...

exactly. google marijuana light spectrum and look at the images you will see charts that will give you all the info. Most all of the charts are linked to RIU threads wherte you will find even more info.

always google ur questions first rather than starting threads that have been beat to death. google search also seems to work better to find forum threads on this site rather than the search engine here.

for flower i use a hps extra par (Photosynthetically Active Radiation) bulb, it has a broader light spectrum, kind of the same idea as running mh and hps together for flower (which by the way i have heard works awesome, but have never done it first hand.)

thanks for the detail tagh, being a college grad in chem and bio i like how u gave a little background and some actual biological reasoning, lets me know who knows what they are talking about and who doesnt. ill just stick to my mh and maybe add a few cfls to the grow from some xtra light spreading

It does not make enough of a difference that you will ever manage to discern.

Won't make a diff WTF man did u not read the past 3 post that people actually thought about and provided me w valuable facts. If you don't give ur plant the desired wavelenghts at it's right point ovb it won't develop correctly. Pls don't comment if u can't provide some real facts/info. As for repeating the post I haven't found a post where someone asked the pro/cons of veg under hps from direct knowledge. I ovb knew it was possible but not desired I was just looking for some real lifers who have actually compared/contrast veg w hps all I read is that it is possible not any real info. Thanks for the replies for those who actually think be4 they post