Light, will switching to Hps after two weeks of Mh.....

robside · Aug 24, 2010

If i switch my lights from Mh (after two weeks) to Hps for two weeks will this affect the growth in a negative way? Ive been on a 24/24 cycle for 17 days with a Mh 400w and id like to switch to Hps 400w for 2 weeks, will this do any damage or slow growth. I have a Digital ballist and both bulbs so i was wondering if i could use both, at different times in the vegg. stage. pic's below are of the girls after 17 days under 400w Mh 24/24.

Mazar i Shariff · Aug 24, 2010

No, you're more than fine!

Some growers actually prefer to use HPS from start to finish. It is definitely the #1 light to use for flower, but it's completely optional what you want to do during veg phase. There have been studies showing more effecient vegetative growth when using MH. Then I have also heard from those who swear to HPS only that you will get tighter internodal length on your plants when used all the way through, which is always a desirable trait to achieve. I say use the equipment that you have and enjoy experimenting!

It's all about testing the waters n finding what works best for you! Nobody will get a grow to it's 100% potential right away.

One love! =)

Serious Weeds · Aug 24, 2010

I believe the hps will stretch your plant a little more. should just wait till flowering to switch. To make the most out of the kind of light it produces.

TommyHobby · Aug 24, 2010

what makes you think you should switch to HPS in the first place ?

also, those leaves look "wide". what is the relative humidity in that grow box ????

miteubhi? · Aug 24, 2010

I agree with Serious. I have used both for veg, and a nice high kelvin mh (hortilux blue) gives maximum growth
while keeping the plants compact and giving more node sites.

southern homegrower · Aug 24, 2010

With my grows the hps made my plants stretch a lot more than I wanted. Now I only switch to hps 2wks after I START 12/12

Magnificient · Aug 24, 2010

You can get as good of a grow using 20/4 lighting. In fact, some of the breeders, especially with automatics, recommend 20/4. I don't know if you know about him, but Uncle Ben is a very respected grower and he uses 20/4 lighting for his grows.

southern homegrower · Aug 24, 2010

i think thats for the veg cycle

Magnificient · Aug 24, 2010

It's for veg for regular plants, but from start to finish for automatics. I was responding to his statement about 24/24 cycle for 17 days.

Light, will switching to Hps after two weeks of Mh.....

robside

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