HPS, MH, Floros, Phillips Cermamic Metal Halide has 'em all beat.

T

ThatOneDude

Well-Known Member
Hey Nat, I checked out that link, they look expensive if I'm right with the conversion rate. Also, this is something that was posted on a CMH thread from another site. I'm not sure if helps or clarifies anything but, honestly, I was only thinking about where I am, not around the world. I am talking specificly about 1 type of CMH bulb, not all CMH bulbs are the same.

"Euro Customers DO NOT BUY THE GREENS HORTI Philips CMH..ITS THE WRONG ONE>
>
the thing on cmh and philips cmh there are Features on the bulb we need..
the lamp we want is a
CMH, 4K, open fixture rated..

I have scoured the Worlds CMH lamps the city was looked at same time as retro white..unless a new cmh comes out the retro white and CMH MHP(USA Versions are the Only option IN CMH 250, 400 watt..

lets compare the two..( USA RETRO WHITE and greens horti )
both philips obv..

cmh retrowhite .............................................Greens horti

..................part#CDM250S50/hor/4k/alto....-..MASTER_CityWhite_CDO_TT_250W_828_E40_SLV
Life..........................20,0000...................................16,000
Init lumen..................20,750....................................22,500
mean lumen................16,600..................................*14,000ish*(not confirmed waiting on Philips UK)
lumen Maint................85%.....................................*75%**(not confirmed waiting on Philips UK)
Kelvin.......................4,000K....................................2,800K
CRI............................85........................................85
Open Fixture................YES......................................NO
(adv tech needs to update there site the lumen on the 250 is wrong on the site)
comparison of Lamp and SPD>>
shortest way of saying it the Euro City white is like HPS half of its overal energy is wasted in Unuesable ranges..it is better than hps though but not same as USA 4K Versions,
when you compare SPD you view the Whole SPD and then the % in the 500-600Ish range.. (ya the retro does wastes some but nothing like the city or hps %)"
 
M

mdgcmd

Well-Known Member
I seen an experiment where one plant was grown under a CMH and an HPS. The plant grew like made but mostly towards the CMH. The theory behind this was bacause of the CMH more natural color temp. They said that they suspect that because the CMH was more like the color of the sun the plant had a preference for the CMH spectrum.
 
ceestyle

ceestyle

Well-Known Member
mdgcmd said:
I seen an experiment where one plant was grown under a CMH and an HPS. The plant grew like made but mostly towards the CMH. The theory behind this was bacause of the CMH more natural color temp. They said that they suspect that because the CMH was more like the color of the sun the plant had a preference for the CMH spectrum.
Click to expand...
ya seen it? i heard that !
 
T

ThatOneDude

Well-Known Member
I dont have a cool tube and I grow in a cabinet. You can touch the end of the bulb but the center is to hot. It depends on your set up as to what you need to cool it. I have a 4 inch axial fan blowing on the bulb and a 4 inch inline fan exchanging air in the cabinet, it runs in the high 70's to low 80's depending on the room temp. I just returned from a 5 day trip and the cab was left to run on it's own. Plants were 6" from the bulb, main buds are the size of a coke can. Mandala Safari Mix, as cheap as the seeds are, the are the best bargin out there!
 
M

mdgcmd

Well-Known Member
Ohhh that sounds do lovely man... can we get some pics of your current grow? I got my ballast and bulb in the mail, but the bulb was blown, so I am again waiting on the new arrival.
 
Psilocobe

Psilocobe

Active Member
Sounds very interesting! Any1 knows the difference between a horizontal and a vertical bulb?
I can't really imagine what that should be. What happens if i use a vertical bulb horizontal?

:peace:
 
T

ThatOneDude

Well-Known Member
mdgcmd said:
Ohhh that sounds do lovely man... can we get some pics of your current grow? I got my ballast and bulb in the mail, but the bulb was blown, so I am again waiting on the new arrival.
Click to expand...
There's a pic in my gallery of the grow area of the cab.
 
ceestyle

ceestyle

Well-Known Member
Psilocobe said:
Sounds very interesting! Any1 knows the difference between a horizontal and a vertical bulb?
I can't really imagine what that should be. What happens if i use a vertical bulb horizontal?

:peace:
Click to expand...
one is designed to be operated vertically, the other horizontally. I can't remember exactly, but if you operate them outside of like 15 degrees of their designed angle, they will either give you poor performance, burn out more quickly, or both.
 
Psilocobe

Psilocobe

Active Member
ceestyle said:
one is designed to be operated vertically, the other horizontally. I can't remember exactly, but if you operate them outside of like 15 degrees of their designed angle, they will either give you poor performance, burn out more quickly, or both.
Click to expand...
Ok. :) Im wondering about 2 CMH 400w bulbs, my closet measures is 21 x 19

Do you think that could work?
 
NLXSK1

NLXSK1

Well-Known Member
Tagged to last...

I appologize for not reading the entire 200+ page thread but I did read part of the white paper associated with these bulbs...

Starting at 40% of their life they lose a significant amount of lumens.

It would seem you would have to use 2 or more bulbs over the stated lifetime to keep it at full strength. That is more cost + maintenance right there...

Also, since it seems like HPS is the largest used system out there, as a newbie I am going to use proven technology before I start to try my own experiments personally.
 
ceestyle

ceestyle

Well-Known Member
Psilocobe said:
Yes inches. Okay, so that wouldn't work out? I know its overkill but, will it work or not?

Use 1 400w in the veg & put another one in there when bloom starts. :)
Click to expand...
I have 18 x 36 w/ 150W HPS and 250W CFL, and that's plenty. Venting heat from 2 x 400W would be an issue ... actually, even fitting them in there would be a pinch.

I'm not sure what you mean by "would it work" . It's just more light than you need.
 
Psilocobe

Psilocobe

Active Member
ceestyle said:
I have 18 x 36 w/ 150W HPS and 250W CFL, and that's plenty. Venting heat from 2 x 400W would be an issue ... actually, even fitting them in there would be a pinch.

I'm not sure what you mean by "would it work" . It's just more light than you need.
Click to expand...
I'm sorry, my english aren't that good u know. :)

But ok, then i buy 1 bulb. My closet is kinda small, you saw the measures a few posts up, and the height of my closet is 43 inches.

Do you think i'll need a cooltube or do you think i can skip that?


/Psilocobe
 
DecentGreen

DecentGreen

Active Member
So im having some decently large heat issues in my grow box, ten of fifteen degrees lower would be nice. If i used the phillips ceramic 400 w in my 400 w hps ballast would that work just as well and be way cooler? cause that would be nice.
 
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