MH vs HPS in bloom - Side by Side Grow Experiments - International Cannagraphic Magazine Forums

the gnome · 08-03-2012, 06:11 AM

its been talked about to no end
but Ive yet to see it done.... easy is it seems?
Ive heard all about MH gets you more resin and less stretch etc etc but personally haven't seen the proof?

my last few runs in my 2000w grows i have been starting to use 1 Mh bulb in the bloom phase after 5 wks to see if resin production increases.
its very inconclusive after 2 runs.

on my current(3rd) run I decided to leave the Mh in from the onset of bloom
now I'm seeing a very noticeable difference!
has anyone else run a side x side with Mh+hps?

the plant in Q is landlocked so to say in its current state and chop is this weekend
BUT
there will be an obvious difference to discuss!

vapedg13 · 08-03-2012, 09:40 AM

i only use mh all the way through the my grows never use hps....used to use it years ago but not anymore

Karmic Farmer · 08-03-2012, 09:53 AM

Very nice Gnome, thanks for the post! You may also want to try adding a black light or reptile bulb instead as an experiment because they emit uvb which is what causes the noticeable increase in trichromes and are much cheaper to run. I'm sure there are other benefits to the MH with increase in the blue spectrum keeping the nodes a little tighter and more compact. I'm thinking of supplementing with a MH or something else just to see myself.

Peace,
KF

sso · 08-03-2012, 10:30 AM

i see an increase in trichromes adding a few 6400k cfls.

so im wondering if its the added blue as well.

the plants look nicer as well, with some blue in the grow.

Karmic Farmer · 08-03-2012, 10:49 AM

The added blue spectrum definitely adds to the overall structure in the flower cycle. If I'm not mistaken UVb can damage the plant, or inhibit it in some way then the plant produces more trichomes to protect itself. Something about pure highland strains having a special effect not seen in the lowland varieties has been attributed to the higher altitudes which have a much higher concentration of UVb.

Peace,
KF

Stonefree69 · 08-03-2012, 04:22 PM

Wouldn't hps yield more though? I heard a combo of 2:1 hps in flowering is best. Guess a Reptisun w/250 µW/cm² radiation could also give those trichomes a little boost.

08-03-2012, 05:01 PM

I have definately noticed the differecences between flowering under hps and mh. Yes, hps makes your buds a little more dense so if it's commercial appeal you seek, then yes, buds will be heavier. MH your buds are little more compact and lighter but i think pack on as much trich coverage as the big buds under hps if not more. Connoisseur (mh) or Commercial (hps).

-DG-

Green Supreme · 08-03-2012, 06:32 PM

I like a 1:1 mix of both. Peace GS

growshopfrank · 08-03-2012, 06:50 PM

Quote:

Originally Posted by Stonefree69

Wouldn't hps yield more though? I heard a combo of 2:1 hps in flowering is best. Guess a Reptisun w/250 µW/cm² radiation could also give those trichomes a little boost.

HPS defiantly yields more we did an trial with 2 HPS 1000 with a MH 1000 in the middle over 4'x8' flood tables VS 3 HPS1000 over the same and the results were that the mix tended to be around 1/4 elbow less with the mix and with blind somewhat subjective testing no noticeable difference in quality this is with testing about a half dozen strains

PS the MH light spectrum sure makes the buds LOOK more resinous

growshopfrank · 08-03-2012, 06:52 PM

Quote:

Originally Posted by Green Supreme

I like a 1:1 mix of both. Peace GS

if you are an old school fucker with a sun circle that's a good ratio

08-03-2012, 06:11 AM	#1
the gnome Senior Member Join Date: May 2010 Location: In a Sour Bubble Posts: 5,233	MH vs HPS in bloom its been talked about to no end but Ive yet to see it done.... easy is it seems? Ive heard all about MH gets you more resin and less stretch etc etc but personally haven't seen the proof? my last few runs in my 2000w grows i have been starting to use 1 Mh bulb in the bloom phase after 5 wks to see if resin production increases. its very inconclusive after 2 runs. on my current(3rd) run I decided to leave the Mh in from the onset of bloom now I'm seeing a very noticeable difference! has anyone else run a side x side with Mh+hps? the plant in Q is landlocked so to say in its current state and chop is this weekend BUT there will be an obvious difference to discuss! __________________ flying in a blue dream! --------------------- Last edited by the gnome; 08-30-2012 at 02:37 AM..
	Quote 3 members found this post helpful.

08-03-2012, 09:40 AM	#2
vapedg13 Member Join Date: Mar 2009 Posts: 333	i only use mh all the way through the my grows never use hps....used to use it years ago but not anymore
	Quote 1 members found this post helpful.

08-03-2012, 09:53 AM	#3
Karmic Farmer Member Join Date: Sep 2011 Location: Arriving Somewhere, But Not Here Posts: 630	Very nice Gnome, thanks for the post! You may also want to try adding a black light or reptile bulb instead as an experiment because they emit uvb which is what causes the noticeable increase in trichromes and are much cheaper to run. I'm sure there are other benefits to the MH with increase in the blue spectrum keeping the nodes a little tighter and more compact. I'm thinking of supplementing with a MH or something else just to see myself. Peace, KF __________________ DJ's law of quality cannabis breeding: "The progeny must equal or surpass it's parent in overall quality and desirability to be considered for future breeding"
	Quote 2 members found this post helpful.

08-03-2012, 10:30 AM	#4
sso Senior Member Join Date: Apr 2011 Location: near the northpole. Posts: 2,133	i see an increase in trichromes adding a few 6400k cfls. so im wondering if its the added blue as well. the plants look nicer as well, with some blue in the grow.
	Quote 1 members found this post helpful.

08-03-2012, 10:49 AM	#5
Karmic Farmer Member Join Date: Sep 2011 Location: Arriving Somewhere, But Not Here Posts: 630	The added blue spectrum definitely adds to the overall structure in the flower cycle. If I'm not mistaken UVb can damage the plant, or inhibit it in some way then the plant produces more trichomes to protect itself. Something about pure highland strains having a special effect not seen in the lowland varieties has been attributed to the higher altitudes which have a much higher concentration of UVb. Peace, KF __________________ DJ's law of quality cannabis breeding: "The progeny must equal or surpass it's parent in overall quality and desirability to be considered for future breeding"
	Quote 3 members found this post helpful.

08-03-2012, 04:22 PM	#6
Stonefree69 Veg & Flower Station keeper Join Date: Jan 2012 Location: Here now & there later... Posts: 3,315	Wouldn't hps yield more though? I heard a combo of 2:1 hps in flowering is best. Guess a Reptisun w/250 µW/cm² radiation could also give those trichomes a little boost.
	Quote

08-03-2012, 05:01 PM	#7
DGSIX Guest Posts: n/a	I have definately noticed the differecences between flowering under hps and mh. Yes, hps makes your buds a little more dense so if it's commercial appeal you seek, then yes, buds will be heavier. MH your buds are little more compact and lighter but i think pack on as much trich coverage as the big buds under hps if not more. Connoisseur (mh) or Commercial (hps). -DG-
	Quote 1 members found this post helpful.

08-03-2012, 06:32 PM	#8
Green Supreme Banned Join Date: Aug 2011 Location: heaven, B.C. Posts: 5,105	I like a 1:1 mix of both. Peace GS
	Quote 5 members found this post helpful.