Using MH bulb for last 2 weeks of harvest? What is the science?

[Kite High]

I'm picking up what your putting down but... can you tell me why horticulture MH's don't provide as much uvb as -------? I can't find any supportive info on this topic. Ed Rosenthal posted a discussion awhile ago on the use of this balance of spectrum and it's tremendous positive affects on trichome production and he's talking regular MH grow bulbs. If there is a better source of uvb I'd love to know so I can look into it. Thanks, I always appreciate learning about something I don't know.

mostly from my testing with a uvb meter as well as the fact that even horti bulbs are actually manufactured for use around people and fed law limits the amount of uvb emissions...secondly the glass used in the formulation of the outer envelope is of a regular and economical formulation which inhibit uvb much to their profitable delight as the glass need to include quartz in the formulation to allow uvb to pass through is more costly to manufacture
these are the only affordable lamps for uvb which produce the amounts of uvb to cause the effect
http://www.lightyourreptiles.com/ard3t546in54.html
http://www.reptileuv.com/megaray-metal-halide-uvb.php

I do believe that mh during flower increases quality/potency and already my opinion of how and why above... I also am a CMH user as I havew found the results more to my liking than mh, hps, mh.hps...am also a fan of cmh/hps in flower at a 2 cmh to 1 hps ratio...
I do not place much faith in mr. Rosenthal as he is a marketing piuppet that is paid to feed misinformation to increase sales for the chosen few as well as he is a good author and marketer and in my experience flat out lies if it pays well

Hope this helps

 

[ChesusRice]

I would like to say MH doesnt increase frostiness. Probably just the opposite.

 

[Kite High]

I also have not found uvb to increase it either. But definitely changes the ratios to a more pleasing high for me as well as increased creeper affect and potency

 

[dolofarmer]

A simple answer is because the MH light spectrum produces more UV light than HPS, UV light makes the trichs more potent. Friends of mine use MH over HPS for quality over quantity purposes. HPS light is also great though, especially if you are going for weight!

 

[Kite High]

A simple answer is because the MH light spectrum produces more UV light than HPS, UV light makes the trichs more potent. Friends of mine use MH over HPS for quality over quantity purposes. HPS light is also great though, especially if you are going for weight!

WOW people do not read do they...mh does not produce uvb in any effective amounts without an outer envelope glass formulation containing quartz

 

[ChesusRice]

Im just thinking I seen pictures of frosty buds that got less frosty after switched over to MH from HPS
And just by that I would say it doesnt work

 

[PJ Diaz]

Im just thinking I seen pictures of frosty buds that got less frosty after switched over to MH from HPS
And just by that I would say it doesnt work

That seems far from scientific. I could take two pics of the same bud a minute apart and make one look less frosty with simple photography lighting techniques. Looking at pictures and basing judgment solely off that is very two dimensional (pun intended).

 

[Scotch089]

Good chart Kite, source?

 

[Kite High]

Good chart Kite, source?

http://advancedtechlighting.com/cmhfact3.htm

 

[ChesusRice]

That seems far from scientific. I could take two pics of the same bud a minute apart and make one look less frosty with simple photography lighting techniques. Looking at pictures and basing judgment solely off that is very two dimensional (pun intended).

I'm going to stick with
Look less frosty

 

[colonuggs]

looks of frostiness.... has nothing to do with genetics and thc % of that plant

If your plants genetics say 15% thc content ....nothing you do will give you a higher %

 

[Dwezelitsame]

more trichs does not = more thc

thc is predetermined in genetics

i have had plants with lots of trichs

weaker then plants with less trichs

and i have had small trichs stronger then big trichs




but to original question
in beginning first 1/3 of flower mh or cmh best = for reduced stretch
middle sage second 1/3 of flowe hps best = rock hard buds
the last staage is best served by mh or cmh = to get the best resuls from final bulk up


1Luv

 

[thoumayest]

Local store guy is pimping the 10k bulbs but says you need a digital ballast for that

"Pimping" LMAO!!!

...brother thats exactly how I feel. I called the dude out one time...striaght up. I asked "Is this product good (green planet nutes) or do you just make sick profits off if it...be honest"

Dude went wide eye on me lol

 

[Kite High]

"Pimping" LMAO!!!

...brother thats exactly how I feel. I called the dude out one time...striaght up. I asked "Is this product good (green planet nutes) or do you just make sick profits off if it...be honest"

Dude went wide eye on me lol

green Planet. The AN wannabes.

 

[blindbaby]

i;l bet it smelled so nice in there..

 

[blindbaby]

no profits. no jobs. profits good. not bad.

 

[jojodancer10]

View attachment 2520375. Well guys this is my Dj short blue moonshine under a eye hort. The hps does put on weight but I never flowered with a MH.I won't mind trying to flower with a mh but I don't want disapointments.

 

[zack66]

i've been using mh's for my entire grow for like the past 3 or so grows after talking to someone on another forum about sunpulse mh's..

the sunpulses come in various k ratings, much in the same way the cfl's do... you just buy the correct k rating for w/e phase of growth you're in at the time.. ie, i use the 6 k for veg, and the 3 k's for flowering.. they even offer a 10k for the last two weeks of flowering, which i have, but have yet to run it yet..
like has been said, mh's have light in the uv range, which is supposed to increase tric production.. it's believed that trics are used by plants kind of like a sun tan lotion... the more exposure to uv lighting, the more tric production on that plant, or that's the science behind it although i'm not 100% about it tbh..
it's also said that the you get a fuller flavor profile from using mh's over hps bulbs.. something about the way mh's effect the terpenoids in cannabis..

overall, like i said, been running the sunpulse mh's for a good three of so grows now, and i have to say i'm impressed.. i'm loving them.. the blue dream i just ran has to be some of the stunkiest bud i have grown to date.. is it all the mh's or do i just kick ass at growing, lol, idk, but what i do know is i'm not going back to hps anytime soon.. it has been said though that hps bulbs will increase your yields while mh's will increase just about everything else, ie, tric production, flavor, etc, etc..

I also am using the sunpulse 3k and I love it. Buds are much denser than when I was running an hps. And you can take good pics of your ladies with the lights on.

 

[jojodancer10]

I been doing some reading about that sunpulse....tell me more

 

[zack66]

One thing is they aren't cheap. But, I think the price is worth it with the end results. Sunpulse says to run their 10k the last couple weeks of flower. I'm going to break down and buy one in a few weeks. Just put my ladies on 12/12.