[FastForward]

I need to keep my plants relatively short...

...so is it better/okay to use MH on them for the first week of 12/12 and then switch to HPS for the rest?

Or should I start and finish them under HPS?

Cheers muchly

FF

[hererisssh]

hps start to finish ff

[British_Hempire]

You can flower under MH if ya want, it will work and the plants will be smellier due to the greater blue spectrum, but HPS works better. Using MH for the first week will not harm the plants but it probably won't make much difference to the stretch.

[FastForward]

Thanks guys...will swap the HPS back this evening

[ProGroWannabe]

FF....if I can add something here...the very best way to keep them short without LST is to HAMMER them with light.

How many plants do you want/need to run in the tent? If you don't have to run lots of plants in a Sea of Green-type fashion, then you might try running a bare bulb with no reflector. You can loop the lampcord over something at the top of the tent and simply let it hang down in the very center. Then the plants will be placed around the bulb so that they encircle it. With a style like this, the plants are encouraged to bush out toward the bulb horizontally instead of shooting straight up. Then all you have to do is turn them once or twice a day during lights-on to keep everything even. Am I making any sense?

I have experimented quite a bit with this very same vertical lighting style that I'm describing to you and believe me IT WORKS WONDERS!

BTW.....a new space that I'm gonna be building is gonna be setup to use vertical lights. Whether you want to go this route or not is totally up to you. I just thought I'd throw it out there.

[theherbalizor]

Well I actually keep the Mhal in until day 14 of flower.

Mostly cause I grow big stretchers and I really believe the Mhal helps to control stretch and up yield by creating smaller more squat plants.

I am going to start with the new sunpulse lights as of tomorrow.

http://www.sunpulselamps.com/doccume...stcard_4x6.pdf

[FastForward]

I think I'll leave the MH in there for a week...i could do with any stretch reduction, if any...

[iagainsti]

i do this on a regular basis. im a big fan of mh, ive run them side by side with my hps and just always like it better. pro gro is totally right though. if you want them to stay short, keep them as close to your light as you deem safe. the closer you keep them to the light the shorter the internoding.....

[hererisssh]

I've always had better results from hps, though I can see where herb was saying it can be used as a means for stretch control.

[kid606]

you can easily use the mh for the first 2-3 weeks in flower..i do it regularly..put the light as close as you can without hurting/stressing your ladies..so it would be good to have an even canopy..after the main stretch from flipping stopped put in the hps for budding..
thats how i do it..