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

polyarcturus

Well-Known Member
Nice...question...your reasons for vertical oriented bulbs in parabolic reflectors?
better light distribution, more indirect light, and bulbs run way cooler. i run similar setup. minus the hood but when your in a 2x4 tent with 400w bare bulb vertically oriented , it is the hood.


Have you tried using HPS and compare the results?
i have recently. my MH plants are killing my HPS plants in quality and in overall happyness of the plant, although i contaminated my results by adding a 270w hps
 

M Dogg

Active Member
Why not just use both all the way, that way you can more closely replicate the suns rays. Isn't that the whole point?
 

urgod

Well-Known Member
i thought its the UV rays from the MH that stimulate resin production. You could also use tanning lights ;) . UV also destroys resin... so unless you know the perfect ratio of UV, you might do more harm than good bro
 

Kite High

Well-Known Member
i thought its the UV rays from the MH that stimulate resin production. You could also use tanning lights ;) . UV also destroys resin... so unless you know the perfect ratio of UV, you might do more harm than good bro
tanning lights are mostly uva...and are more costly and cumbersome than what I listed...IMO a decent uvb meter is needed to do it right....more than 400uw/cm2 will decrease yield with no additional effect
 

colonuggs

Well-Known Member
Nice...question...your reasons for vertical oriented bulbs in parabolic reflectors?
360* light.... not 180* and the other 1/2 bounced & reflected....using my light meter ...there is a noticable difference between them.

to get the same lux/footcandles.. the hori has to be in a 4x4 area... the vert can be a in a 5x5

settin up 4 luxors in a 10 x10 (vertical vented square parabolic with glass)


[video=youtube;2zVzgPPDTsE]http://www.youtube.com/watch?v=2zVzgPPDTsE[/video]
 

colonuggs

Well-Known Member
you where reading my other thread advocating the 4000k mh bulbs werent you?

No...dont even know who you are.... if you look on other websites.... i tell everyone to use the sylvania bt56 for the entire grow
https://www.icmag.com/ic/showthread.php?t=243060

They try it...they are surprized by the results :)


In my 20 + of growing the kind.....I tired hps, combo and all mh... through multipul grows and experimentation...

IMO mh produces heavier densier buds... the end product is kick ass

Everyone should try their own experiments and go with what works best for them
 

ynkessuck247

Active Member
If anything, use the MH 2 week in the beginning of flowering. This could reduce stretching because of less red light emitted.
 

polyarcturus

Well-Known Member
No...dont even know who you are.... if you look on other websites.... i tell everyone to use the sylvania bt56 for the entire grow
https://www.icmag.com/ic/showthread.php?t=243060

They try it...they are surprized by the results :)


In my 20 + of growing the kind.....I tired hps, combo and all mh... through multipul grows and experimentation...

IMO mh produces heavier densier buds... the end product is kick ass

Everyone should try their own experiments and go with what works best for them

no im not on another websites, but i agree with you 100% the 4000k is the bomb ass bulb. and me too, to many experiments to list but it seems i am coming to the same conclusion as you, that MH is better and vertical positioning for the bulbs provide better lighting.
 

Mcwhippin420

Well-Known Member
Yo I got sun system 2... 400w hps / mh my 3 bagseed girls got couple weeks left been using eye hortilux HPS n 2 days out week switching to mh... Also have a dual arc bulb not sure if it's mh or hps tho gotta ask dude bought it off lol the case to light says nothing so I should use MH for rest of flowering ?? :) think I'm try that never have to switch bulbs lol
 

Kite High

Well-Known Member
360* light.... not 180* and the other 1/2 bounced & reflected....using my light meter ...there is a noticable difference between them.

to get the same lux/footcandles.. the hori has to be in a 4x4 area... the vert can be a in a 5x5

settin up 4 luxors in a 10 x10 (vertical vented square parabolic with glass)


[video=youtube;2zVzgPPDTsE]http://www.youtube.com/watch?v=2zVzgPPDTsE[/video]
Thank you. Am familiar with the Luxor. So more even distribution is the reason. Simplifies things as no need for light movers.
 

Kite High

Well-Known Member
No...dont even know who you are.... if you look on other websites.... i tell everyone to use the sylvania bt56 for the entire grow
https://www.icmag.com/ic/showthread.php?t=243060

They try it...they are surprized by the results :)


In my 20 + of growing the kind.....I tired hps, combo and all mh... through multipul grows and experimentation...

IMO mh produces heavier densier buds... the end product is kick ass

Everyone should try their own experiments and go with what works best for them
i believe that the Luxor equipped with this should kick ass
http://www.growlightexpress.com/ceramic-metal-halide-bulbs-9/philips-energy-advantage-cdm-allstart-lamp-830-watt-1943.html
 

smellzlikeskunkyum

Well-Known Member
edit, the reason i started to ask about the sunpulses in the first place was that i was running a digital ballast and was using eye hortilux blue brand bulbs, about $110 or so per..
about a month into a new bulb i went to check on the girls and the bulb had blew.. yeah, i was pissed to say the least.. the sunpulses like a few other brands like digilux and oshio are said to be made in conjunction with the higher frequencies that digital ballasts fire at, extending the life in the process.. :D
i have a lumatek 600 hps. i kept blowing bulbs left and right until i shelled out the dough for an eye hortilux super hps. best bulb i ever bought. i even noticed a difference in the quality of buds, over the other hps bulbs i was using.

i hear alot about using MH over hps... i dont know if i agree 100% tho. i watched a grow a while back that had an awful lot of blue light on one side, and pure standard hps on the other. on the blue side the plants got super lanky, and only in spots where the light was intense did i notice heavier resin production. in fact the hps bud ended up being better in general. and the blue bulb was brand new... the other wasnt.

now im speaking of an hps that was blue, not a MH. im just very skeptical of UVB doing anything for resin. if it really made a big difference im sure the market would be flooded with new uvb inventions. only thing i see that may shows a slight difference is in LED lighting. personally i only believe it helps LED. not hid.
 
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