Led or HPS

steve870

steve870

Well-Known Member
Hi,

I am currently in my first grow ( 2 weeks since flowering). I am growing with a mars hydro ts-1000(150 watt) in a 2x2 area inside my closet which is 2x4. i would like to expand for my next grow and use all of my closet. I am debating wether i should get a 400 watt hps or buy a second mars hydro light ( sp-150)(i would still veg with my LED). I feel like my led doesn't have enough power, water consumption from my plants is low and i have difficulty to flush my pots. I will use coco coir next time. should i go with a cooled hood or not? will the heat be manageable without it? I have a 4 inch inline fan venting 200 cfm outside my closet with a carbon filter.
I also don't want any diy builds or lights above 225$ Canadian ( price of one 400w with the cooled hood)

thanks
 
Last edited:
diggs99

diggs99

Well-Known Member
Personally if i were in your spot and wanting a new light id go for a 315 cmh to go with your mars. Altho you bring up a good point about heat. What are your ambient temps in the room where closet it?

Im not sure an air cooled 400w hps is any cooler than a 315 cmh anyway to be honest.


This sunstream comes with a bulb and is prob best bang for your buck.

SunStream CMH 315W CDM，Vertical Ceramic Reflector，with 3100K Halide Bulb，Vertical（315W）: Amazon.ca: Patio, Lawn & Garden

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www.amazon.ca

I own this vivosun and love it, it dont come with a bulb tho so makes it a little outside your budget

VIVOSUN 315W Ceramic Metal Halide CMH/CDM Grow Light Fixture w/No Bulb, ETL Listed, High-Reflectivity Vega Aluminum Hood, 120/240V Ballast, Full-Spectrum Hydroponic Grow Light and Suspension System : Amazon.ca: Patio, Lawn & Garden

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www.amazon.ca


This is also a decent priced 315 cmh but i cant speak for the brand, never used it. Comes with bulb

MIXJOY 315W Ceramic Metal Halide CMH/CDM Grow Light Kit, ETL Listed, High-Reflectivity Aluminum Hood, 120-240V Ballast, Full-Spectrum CMH Hydroponic Grow Light and Suspension System: Amazon.ca: Patio, Lawn & Garden

Find products from MIXJOY at low prices. Shop online for barbecues, mowers, garden tools, generators, snow blowers and more at Amazon.ca
www.amazon.ca
 
steve870

steve870

Well-Known Member
i keep my appartement at 23 c so that my closet is around 26 celcius( around 77-79). I could lower my appartement temperature to 18 celcius. Is a coooled hood worth the money?
 
Kingrow1

Kingrow1

Well-Known Member
If you go hps id get a switchable 600w digital ballast then you got 250/400/600/660 but will have to buy 600w bulbs for all settings whivh is only a very small cost extra.

Cmh 315's seem good for some tent sizes but id push for a hps in others.

Air cooled hoods do very little whatsoever - heat is radiation conduction and convection, radiation or light simoly passes through glass and air so you cant cool that with a hood. Good airflow and room temps adjust for heat :-)













Cmh 31
 
Kingrow1

Kingrow1

Well-Known Member
I actually stay away from leds - their aggressive sales tactics over the years has not made for a friendly happy market us hobbyists are use to and cmh and hps are just too good not to have to look elsewhere :-)
 
steve870

steve870

Well-Known Member
thanks for answering my main question. I will look into hps since it is much cheaper. I won't bother with a cooled hood either.
 
3rd Monkey

3rd Monkey

Well-Known Member
Bump temps up to 82-85F with 60-70% humidity through veg, 75-80F with 50-60% humidity through most of flower with a drop to 40% humidity the last 2 weeks or so, and you should have no problems under LEDs.

I was strictly HID lighting. Got my first set of LEDs and dialed in my environment... They perform better than HID. Just takes tuning to figure it out. Environment is much more critical under LEDs.

That said, if you need heat in your room, HID can provide it better without supplemental heat.
 
coreywebster

coreywebster

Well-Known Member
Kingrow1 said:
If you go hps id get a switchable 600w digital ballast then you got 250/400/600/660 but will have to buy 600w bulbs for all settings whivh is only a very small cost extra.

Cmh 315's seem good for some tent sizes but id push for a hps in others.

Air cooled hoods do very little whatsoever - heat is radiation conduction and convection, radiation or light simoly passes through glass and air so you cant cool that with a hood. Good airflow and room temps adjust for heat :-)













Cmh 31
Click to expand...
Most of the heat comes from the bulb though, it been hundreds of degrees and enough to stick your hand to it and massively burn you. Granted the heat is conducted to the air but an air cooled hood still removes 33% of the heat from the environment, or stops it getting into the space in the first place.
 
coreywebster

coreywebster

Well-Known Member
Steve air cooled hoods are well worth it.

For my old set up before I went LED I could run 2 x 600w hps with the fans and set up I had in open hoods or I could run 3x 600s if they were air cooled.

Also 3rd monkey is correct on what he says about environment with LED
 
3rd Monkey

3rd Monkey

Well-Known Member
steve870 said:
howmuch did you spend on LED's?
Click to expand...
That's kind of a loaded question.

HID is generally cheaper for the unit, just replace bulbs. Temp and humidity have more leeway. Power consumption is generally more.

LED is slightly more expensive fie the unit, bulbs they last much longer. In addition, they are less bulky but generally require supplemental heat or even humidity (at least until you have established plants under them). They use much less power than HID and even spread is much easier to accomplish.

In a 2x2 area, an HLG 100 will do just fine, but you may have to boost temps and humidity. 2 would be overkill, but it would allow you to expand to 2x4 without sacrificing any spread really.

The HLG 100s usually run $150ish but come with the driver. You can get them in 3k or 4k. $300 and you would have full coverage and then some in a 2x4, using 200W (190 true watts).

You could build a better setup for around the same price point, but depends on if you want to build.
 
420_Graze_It

420_Graze_It

Active Member
Another vote for 315w CMH. Some of the best spectrum coverage at that price. Buy the hortiulux bulb with it and you're golden.
 
D

DankNoTill

Well-Known Member
Stick with hps or cmh if cost is a factor, if not, Hlg, rapidled Gromau5 pucks or any fair priced fixture using Samsung diodes. 3k/4k/5k/660nm
 
3rd Monkey

3rd Monkey

Well-Known Member
steve870 said:
i have less control over my environment so i really think a 315w is the way to go, i will wait and see if there are any sales this weekend
Click to expand...
If you can't manage your environment very well, I agree. It'll give you much better results with less hassle. You may need to bump humidity with the temp increase though. Cheap $25 vaporizer from an outlet store or Amazon will do a 4x10 room no problem.
 
Kingrow1

Kingrow1

Well-Known Member
My exhaust pulls the same volume of air under negative pressure wether air hood or not and that exhausts the same omount of heat, its basic physics.

Actually trying to cool a super hot bulb aint a smart idea.

If your having to adjust for leds most likely you need more light not heat and thus would do better adding more.:-)

coreywebster said:
Most of the heat comes from the bulb though, it been hundreds of degrees and enough to stick your hand to it and massively burn you. Granted the heat is conducted to the air but an air cooled hood still removes 33% of the heat from the environment, or stops it getting into the space in the first place.
Click to expand...
 
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