Switching from HPS to MH last week of grow?

[Razz0r]

Wanted to ask about this, have read that changing the globe over to MH instead of HPS will give the buds an extra kick due to UVb light helping form more THC.... Or something to that effect. 

 

Thoughts?

[Frank Reynolds]

I have wanted to try this out but the way my tent is set out i can't change the globes over without knocking the colas around like hell

[Razz0r]

I have wanted to try this out but the way my tent is set out i can't change the globes over without knocking the colas around like hell

 

Crap, didn't think of that

[Stix87]

I think some people use mh during veg then switch to hps during flower. But would be a pain swapping just for a week if you grow over grown jungles .

[chopperw33d]

I have seen it done, changing to MH in the last week or two. It can be a pain in the ass to change the globe, but it does help out. 

If changing the globes is not a pain in the ass, running 1 MH per 2 Hps through flower works really well. Then All MH in the last 2 weeks, or just throw put some CFLs in with you Hps.

There was a good write up about it on 420mag I think, I read few years back. Can seem to find it atm.

But what he was saying was, he had 1000w changeable Solteks. Started with MH, set to 400 w, changed to 12/12 then increased to 600w but stayed MH for first week - 2, till they started showing. Then changed alll then globes out for Hps for 2-3 week, then changed to 1000w, till the last 2 week he put MH back in at 1000w. 

Main down sides is the cost on the 1000w soletek. Not sure what the cost of them are these days, but back then they where new and cost 550$ each, plus your globes.

Power increase didnt look like a massive amount as he ran them at 400w. However thats USA prices, and there power seems dirt cheap compared to Auz.

 

I run 4 hps and a 400w mh in the mid, and spin the girls every week. But when I get some extra $$ I will replace my 400Mh and get 4-6 130w Cfl and put them in the corners and stuff. Saves me spinning each week.

 

 

600 Hps  - -- - -- - --  600Hps

 

                  400Mh

 

600Hps ----------------600Hps 

[Razz0r]

I have seen it done, changing to MH in the last week or two. It can be a pain in the ass to change the globe, but it does help out. 

If changing the globes is not a pain in the ass, running 1 MH per 2 Hps through flower works really well. Then All MH in the last 2 weeks, or just throw put some CFLs in with you Hps.

There was a good write up about it on 420mag I think, I read few years back. Can seem to find it atm.

But what he was saying was, he had 1000w changeable Solteks. Started with MH, set to 400 w, changed to 12/12 then increased to 600w but stayed MH for first week - 2, till they started showing. Then changed alll then globes out for Hps for 2-3 week, then changed to 1000w, till the last 2 week he put MH back in at 1000w. 

Main down sides is the cost on the 1000w soletek. Not sure what the cost of them are these days, but back then they where new and cost 550$ each, plus your globes.

Power increase didnt look like a massive amount as he ran them at 400w. However thats USA prices, and there power seems dirt cheap compared to Auz.

 

I run 4 hps and a 400w mh in the mid, and spin the girls every week. But when I get some extra $$ I will replace my 400Mh and get 4-6 130w Cfl and put them in the corners and stuff. Saves me spinning each week.

 

 

600 Hps  - -- - -- - --  600Hps

 

                  400Mh

 

600Hps ----------------600Hps 

 

 

Cheers man - I am lucky enough to have that solistek ballast and I have MH & HPS 1000w & 400w globes. In fact my grows been using the 1000w MH & HPS but dimming them to 600w. Haven't yet used the 400w ones. 

 

BUT - my two girls have stretched big time - but then I can take them out of the tent and change that globe easy as. 

 

Is the general idea for the last 2 weeks or the last week? I am going to do it with my autos which have been HPS all the way apart from seedlings. 

I got 3 weeks left from Friday. 

Edited June 24, 2015 by Razz0r

[chopperw33d]

Yer, that is really nice you got 1000w. You can play with the full range and MH and HPS. 

 

Yer the idea is last 2 weeks, when they are in full form making Tric. Depends on your flower time.

[iTiC]

A 10K MH in the last two weeks is best otherwise a 3k will flower well enough. The 6.4K would have too much blue. GL, looking forward to the full blown bud show.

[Razz0r]

Awesome. Since they are autos I'll do it for the last week to help them frost up. :-) Cheers guys

[omagee]

some people add lights like reptile lights to bring more uv.