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MH vs HPS in bloom

blueberrydrumz

Active member
ICMag Donor
Won't fug up your harvest. May get a smaller yield. The fall sun is more gold in color so HPS mimics that sun. Don't let anyone tell you different. It's that simple. I've done both, HPS is best in flower.

Hey Hank,you say you have done both, but did you try switching to HPS after stretch? i think that makes the most sence - as MH does keep stretch down & makes more more internodes...so veg with MH then keep them on till like week 3 of flowering, then switch to HPS
 

shizznit

Member
with all the bullshit info on here. with people doing tests without a control room... .. the entire mh vs hps.. i dont know i think its strain dependent.. depends what it was bred under? i dont know but im so fucking confused.. i run hps for flower.. and now i wana try mh. but im affraid that it will fuck up my harvest and i depend on my harvest to live now that my job has cut back on hours .

How about Billions of years of evolution as a control?
These Billions of years have taught plants to recognize the spectrum of Sol, and the color is?
----------------------------------------------------------------

The temperature of the Sun is approximately 6,000 Kelvin. The Sun, and stars like our Sun appear white. This is because we’re seeing all the different color photons coming from the Sun at the same time. When you add all those colors up, you get pure white.
 

shizznit

Member
add that to this, and you get blue light being the best primary source of light for plants (besides the sun)
 

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bowzer

Member
with all the bullshit info on here. with people doing tests without a control room... .. the entire mh vs hps.. i dont know i think its strain dependent.. depends what it was bred under? i dont know but im so fucking confused.. i run hps for flower.. and now i wana try mh. but im affraid that it will fuck up my harvest and i depend on my harvest to live now that my job has cut back on hours .

when i first started growing I went with a 2:1 mix of hps/mh, because i had the light and didnt want it just sitting there unused.

I was very pleased with the results so I didnt want to change. However, for some reason, the next run I initially used all hps during flower. after about 1 month of flower, i realized a mixture was better, my plants liked the 2/1 mix better than all hps. It made sense to me, because visually the light seemed more like sunlight.

Now I have another light, its a 600w mh/hps, my 400w is hps only. so this run, instead of running all hps, I'll be running 3/2 mh/hps.

hopefully ill get the same or better results than I was with my 400hps/250mh.. any thoughts on this???
 

diseasedmind

Active member
Got one of each of these bulbs. Going to run the 1000 watt MH with enhanced reds for first 2 weeks, then go to the 1000 watt HPS with the enhanced blues for the rest of flower. prob wont be as big of a shock like when switching the spectrum right from MH to HPS.
 

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shizznit

Member
when i first started growing I went with a 2:1 mix of hps/mh, because i had the light and didnt want it just sitting there unused.

I was very pleased with the results so I didnt want to change. However, for some reason, the next run I initially used all hps during flower. after about 1 month of flower, i realized a mixture was better, my plants liked the 2/1 mix better than all hps. It made sense to me, because visually the light seemed more like sunlight.

.. any thoughts on this???


This reflects my experience exactly, using a 5x8 table with 2x 1000, one MH and one HPS, the plants that were the nicest, and yielded the best were the ones in the middle of the table, directly between the 2 different bulbs.
I repeated the experiment many times, one time Hash-Masta Kut made oil from them and the results were 2.9 (vs 2.7 as the standard) grams of BHO from 12 grams bud....
 

HemperFi

Member
Flying in a blue dream? Surfing with the alien too? I met a humanoid creature visiting from another galaxy. He said his home planet was also called Earth, and that we are all related like brethren and have the same God and Savior.

He shared some seeds that are about ten times larger than anything I've ever seen, like acorns. In fact, he said fowls lodge in the branches there. I'm frightened to plant anything that large in the US. I'm waiting to move to south america. He stated that he would return on the eve of the great tribulation. Crazy huh?
 

Rolldaddy

Member
Highomt,

If you are looking into buying new lights check out lumateck 600 dual on amazon. 1 digital balast that runs mh or hps that also runs 2 600w lamps at the same time with an independent output control for each light. Those balasts use less than 3 amps and on amazon it's under $300.
 

Hank Hemp

Active member
Veteran
Yes blue exactly

Yes blue exactly

Hey Hank,you say you have done both, but did you try switching to HPS after stretch? i think that makes the most sence - as MH does keep stretch down & makes more more internodes...so veg with MH then keep them on till like week 3 of flowering, then switch to HPS

That's what I do. Should have been more clear in my post. Here's what I do veg-MH, flower-first two weeks MH then finish with HPS. I think you may limit the stretch a bit that way. I agree 100% with you. :tiphat:
 

nephrosis

Active member
Got one of each of these bulbs. Going to run the 1000 watt MH with enhanced reds for first 2 weeks, then go to the 1000 watt HPS with the enhanced blues for the rest of flower. prob wont be as big of a shock like when switching the spectrum right from MH to HPS.


i gotta see this... What kind of enhanced red MH bulb do u have? i want to see if i can pick up a 600w
 

nephrosis

Active member
That's what I do. Should have been more clear in my post. Here's what I do veg-MH, flower-first two weeks MH then finish with HPS. I think you may limit the stretch a bit that way. I agree 100% with you. :tiphat:


I did that on my first grow and it came out to work pretty damn well... but for the sake of science im going to do a full mh run then hps then mx em again and see what i can get....
 

bigscoot

legal medical grower got my card & paper work 2 pr
Veteran
imo i think tha plants under tha MH are frostier n seem kinda tight nugget wise but they grow better under HPS 4 bloom but dual arc bulbs would be best n i got plants under all 3 n bloom now ill post up pics later of each light n how plants look there n differ stages but u can tell tha difference
 
B

BasementGrower

do u guys think i cuold go from running cooltubes or air cooled hoods.. to just exhausting more with barebulbs.. iunno i kinda wana go vert. i just wana see if i shouold do a vertical stadium or not.
 

youngsta

New member
This idea may have been brought up already, but it is possible that plants in similar conditions will put out the same amount of crystals regardless of MH or HPS. Larger buds with a HPS could give the impression of having less trichomes due to them being more spread out, while the compact buds from a MH would hold the same number of trichomes in a smaller area.

:tumbleweed:
 

blueberrydrumz

Active member
ICMag Donor
<p>
This idea may have been brought up already, but it is possible that plants in similar conditions will put out the same amount of crystals regardless of MH or HPS. Larger buds with a HPS could give the impression of having less trichomes due to them being more spread out, while the compact buds from a MH would hold the same number of trichomes in a smaller area.</p>
<p> </p>
<p><img src="../../ic/images/smilies/tumbleweed.gif" border="0" alt="" title="Tumbleweed" smilieid="159" class="inlineimg" />
</p>
<p> </p>
<p>you might be on to something here... in the end it boils down to how we can get the most bud, grams/watt is what its about...so i guess we will never find out till someone does some test in 3 or 4 control rooms:;<br/>
1 - HPS
<br/>
2 - MH
<br/>
3 - HPS/MH 75/25
<br/>
4 - HPS/MH 50/50</p>
 
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blueberrydrumz

Active member
ICMag Donor
do u guys think i cuold go from running cooltubes or air cooled hoods.. to just exhausting more with barebulbs.. iunno i kinda wana go vert. i just wana see if i shouold do a vertical stadium or not.

it is possible yes, & prob better! you would have to have a big enough filter & scrubber though... theres some infos about it on the growroom design board
 

the gnome

Active member
Veteran
i'm glad to see more people with an open mind trying Mh in bloom.
there are plenty of strains that flourish under it in bloom.

here is the plant that got me to post this thread
its secret recipe from CGS
(diesel#1xabusive kush)X chemBX1 or 2?

it looked very good growing under horti super hps 1000w
I thought it was doing quite well
my take was about 40grams dry
picture.php




well the hps did ok...... until you look at the
same plant under a Mh solarmax 1000w 7200K
its a pretty damn blue bulb,
about as far to the blue spectrum as they make for plants, past this and its aquarium use but I'd like to try a 10,000K just to see what it does.
my take on this was 61 grams dry.
i don't care how the nonbelievers slice it
this is a huge difference thats pretty hard to discount, i mean when someone tweaks fertz and reflector's or what ever and get a 5-8% increase in they're yield, it's a big deal
but 30% more??(not sure of the math)
total combined is 101 g's
hps--40g's
Mh---61g's


picture.php



I see lots of new posters, read the 1st 13 pages of this post.
thats where your gonna find the best info.

how well a plant responds boils down imo, to strain/genetics.
some plants just do better under hps but the thinking that hps does a better in bloom---> *hands down* is a position that is a very leaky vessel that doesn't hold water very well*
given what ive seen and learned from others in this thread.



The fall sun is more gold in color so HPS mimics that sun. Don't let anyone tell you different. It's that simple.
and now, to take it a bit further,
ive read things like the fall sun is more like hps,
therefore hps is superior for bloom...
oh really? lol
tell that to the more equatorial growers that don't have an *autumn sun*
in the 70s at around 30-33degree's latitude my mexican strain I was growing were starting bloom in late july and by mid sept were ripe for the taking,
never coming close to someones idea of the fall sun and to take this misguided view a bit further about waht
an *autumn sun really is
an autumn sun still has the same spectral makeup as an april sun or feb/winter sun.
so does the sun change into an hps colored star in fall???
nope,... days just simply get shorter and the majority of that shorter day like any other day of the year
the sun looks the same........ because it is the same!!
its that simple :smoke:

the only time you might get a more hps looking sun and sky is because your looking at it through a lot more atmosphere,
just like any other day of the year
so please!
where explain the logic behind that mindset that hps is like the sun in autumn and the plant grows much better concept???

here's vapedg13's results using a $21 Mh 1000w 4000k bulb
5 zips per plant in a gallon and a half container
and now i have one of these and the light resembles real sunlight way more than any hps ever has .... :)
 

nephrosis

Active member
i'm glad to see more people with an open mind trying Mh in bloom.
there are plenty of strains that flourish under it in bloom.

here is the plant that got me to post this thread
its secret recipe from CGS
(diesel#1xabusive kush)X chemBX1 or 2?

it looked very good growing under horti super hps 1000w
I thought it was doing quite well
my take was about 40grams dry
View Image



well the hps did ok...... until you look at the
same plant under a Mh solarmax 1000w 7200K
its a pretty damn blue bulb,
about as far to the blue spectrum as they make for plants, past this and its aquarium use but I'd like to try a 10,000K just to see what it does.
my take on this was 61 grams dry.
i don't care how the nonbelievers slice it
this is a huge difference thats pretty hard to discount, i mean when someone tweaks fertz and reflector's or what ever and get a 5-8% increase in they're yield, it's a big deal
but 30% more??(not sure of the math)
total combined is 101 g's
hps--40g's
Mh---61g's


View Image


I see lots of new posters, read the 1st 13 pages of this post.
thats where your gonna find the best info.

how well a plant responds boils down imo, to strain/genetics.
some plants just do better under hps but the thinking that hps does a better in bloom---> *hands down* is a position that is a very leaky vessel that doesn't hold water very well*

given what ive seen and learned from others in this thread.

and to take it a bit further,
ive read things like the fall sun is more like hps,
therefore hps is superior for bloom...
oh really? lol
tell that to the more equatorial growers that don't have an *autumn sun*
in the 70s at around 30-33degree's latitude my mexican strain I was growing were starting bloom in late july and by mid sept were ripe for the taking,
never coming close to someones idea of the fall sun and to take this misguided view a bit further, when you think of an autumn sun, its still has the same spectrum makeup as an april sun or winter sun.
the sun doesn't change into an hps colored star in fall,
days just simply get shorter and the majority of that shorter day like any other day of the year, it looks the same to me?
except sunrise and sunset where you might get more hps looking sun and sky because your looking at it through a lot more atmosphere.
so please!
where is that logic behind that mindset that hps is like the sun autumn and therefore thats what the plant grows much better concept???

here's vapedg13's results using a $21 Mh 1000w 4000k bulb
5 zips per plant in a gallon and a half container
and now i have one of these and the light resembles real sunlight way more than any hps ever has .... :)
[URL=http://i888.photobucket.com/albums/ac84/vapemaster/113.jpg]View Image[/URL]


And now i have my proof. TY sir! i will not be getting any enhanced hps bulb but rather be buying enhanced MH bulbs!

I can only imagine what the plants what do under 3k w, MH in 6.4k, 7.2k and 10k....1000w in each spectrum!! i wish i had the cash atm, id do it right now to test it lol
 

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