Ventilation and exhaust question.

[Deadphish1965]

I am building a 4x2x6.5 cabinet. What size charcoal filter will make sure there is no smell exhausting out into the room? From what I've read a 400cfm is sufficient. Does that sound right.

Also, I still can't decide on my led light. I was thinking the kind k5 series or advanced platinum LEDs but I hear they are overpriced. Any suggestions?

Thanks in advance

 

[Boyd Crowder]

get a 400cfm unit and filter idk maybe the 16" or taller
dont go with led right now
1 600w hps and ballast will work perfect

 

[Deadphish1965]

Hps is cheaper but won't I have to vent the light to meep my cabinet cool? My other reason for led is they are thin. I'm already going to have my work cut out for me. I'm a sativa guy.

 

[Deadphish1965]

Can you still scrog a stretchy sativa with a hps if you only 6.5 feet? I thought led with hot5 side lights would give me the best chance.

 

[Phaeton]

Also, I still can't decide on my led light. I was thinking the kind k5 series or advanced platinum LEDs but I hear they are overpriced. Any suggestions?

Thanks in advance

The Platinum brand is one of the least expensive LED grow lights that can actually grow and bud marijuana. About half the price of Black Dog or Advanced XTE.
It will most definitely outperform HPS in a watt for watt comparison.

 

[Deadphish1965]

Thanks for the advice Boyd and Phaeton.

 

[Phaeton]

"...led with hot5 side lights would give me the best chance"

Side lighting, an issue I have been pushing for years.
I ran a lighting test room for two years, one of the items was side lights versus no side lights at the same wattage level.

Two 400 watt CMH overhead in a stationary position for two harvests.
One 400 watt CMH and a pair of 216 watt T5 side lights for another two harvests. Plants were rotated a quarter turn every watering. The plants did not enjoy side lighting on all four sides, no firm reason why.
Same clone mother for all plants.

The yield from plants with the sidelights was 15% higher than the stationary plant with overhead lighting only. I felt rotating a plant with a light directly overhead would change no shadows or light intensity.
Most of the increase was lower buds, the main cola was similar but the first ring of secondary buds was heavier. The further down the plant the more the difference from the control. Lower buds were still quite a bit smaller than upper buds but could no longer be classified as 'popcorn', they became dense.

Ever since then (2007-2008) I have used side lights in all four stations, clone, sprouts, vegging, and flower.

The process of replacing half the T5s with LEDs is finished.
300 watts of passive LED has almost triple the penetration as a 324 watt T5 but costs $750 versus $150. If I was young I would stick with the T5s, but after two heart attacks the bulb changes and reflector cleaning became difficult.
UVB is more efficient from the side and only available in fluorescents, my clones use a T8 shop light ($20) with a pair of Naturesun 2% UVB tubes, clones remain undamaged while it sets them up for a life with UV.

 

[Granger2]

2x4x6.5=52 cu. ft. A 4" fan @ 170 cfm is well over 2 air exchanges/min. w/carbon filter. Get a Phresh 4x12 filter. Good luck. -granger

 

[ChasingGreen]

"...led with hot5 side lights would give me the best chance"

Side lighting, an issue I have been pushing for years.
I ran a lighting test room for two years, one of the items was side lights versus no side lights at the same wattage level.

Two 400 watt CMH overhead in a stationary position for two harvests.
One 400 watt CMH and a pair of 216 watt T5 side lights for another two harvests. Plants were rotated a quarter turn every watering. The plants did not enjoy side lighting on all four sides, no firm reason why.
Same clone mother for all plants.

The yield from plants with the sidelights was 15% higher than the stationary plant with overhead lighting only. I felt rotating a plant with a light directly overhead would change no shadows or light intensity.
Most of the increase was lower buds, the main cola was similar but the first ring of secondary buds was heavier. The further down the plant the more the difference from the control. Lower buds were still quite a bit smaller than upper buds but could no longer be classified as 'popcorn', they became dense.

Ever since then (2007-2008) I have used side lights in all four stations, clone, sprouts, vegging, and flower.

The process of replacing half the T5s with LEDs is finished.
300 watts of passive LED has almost triple the penetration as a 324 watt T5 but costs $750 versus $150. If I was young I would stick with the T5s, but after two heart attacks the bulb changes and reflector cleaning became difficult.
UVB is more efficient from the side and only available in fluorescents, my clones use a T8 shop light ($20) with a pair of Naturesun 2% UVB tubes, clones remain undamaged while it sets them up for a life with UV.

Thank you for that very valuable information. If I had an extra t8 laying around, would it be ok to put it on one side of the tent only? I don't want to go buy more lights for the other 2 sides (excluding the front since that's the entrance to the tent).

 

[Boyd Crowder]

dood - fuck led - go vertical around 1 600w hps

a watt is a watt - a (real) 600w led runs just as hot as a 600w hps its just spread over more surface area, but in an enclosed space its still the same heat. however , the par values and the lumens are nowhere close in head to head , I dont care what anyone says. Youd have to spend triple and build the unit yourself to get close to the overall lumens and par of a simple hps system
with verticle , you get ease of cooling, a 360* light source and its cheap as fuckall

 

[Deadphish1965]

Thanks again guys.

 

[Deadphish1965]

Boyd, I'm looking back into a 600hps. Well see...

 

[Deadphish1965]

Have you used LED before Boyd?

 

[mojave green]

Boyd's is correct. A watt is a watt. And the 600w hps is about as efficient as it gets.

 

[Boyd Crowder]

i used the mars II 900 for my first 2 runs
its 450w draw and does maybe 22k lumens
it was 250 new off ebay
my 600hps , i gathered together from craigs and some grow shop hoods
i have about 150 in each of the 3 with new optilume bulbs
they put out either 44k or 60k lumens i dont have the chart in front of me atm
if you have limited space a verticle style grow will more than double your grow area
you can do it flat for 8 sqft or vertical with about 40 sqft of area in your room

 

[Deadphish1965]

i used the mars II 900 for my first 2 runs
its 450w draw and does maybe 22k lumens
it was 250 new off ebay
my 600hps , i gathered together from craigs and some grow shop hoods
i have about 150 in each of the 3 with new optilume bulbs
they put out either 44k or 60k lumens i dont have the chart in front of me atm
if you have limited space a verticle style grow will more than double your grow area
you can do it flat for 8 sqft or vertical with about 40 sqft of area in your room

Do you think I could fit a carbon filter, fan, and hood for a 600hps all at the top?

Are Lumens more important then PAR?

 

[Phaeton]

Lumens are the measure of light at 555 nm. This is greenish light being measured at maximum sensitivity in human eyes. When used in commercial messages it is very often a made up number as LED growlights have almost none of this frequency.

The red meter centers at 650 nm,
the blue meter at 460 nm,
the UVB centers at 290 nm,
the green meter measures Lumens at 555 nm.
PAR is all wavelengths (400-700) averaged together.

Par can be misleading as a low pressure sodium is 100% PAR but will not grow any plants anywhere. A high lumen reading without full spectrum added will not grow a plant either. Balanced light grows plants, meters need to measure more than a single item to be efficient predictors of performance.

I own the full complement of meters and have found little correlation between what the advertisements say and what is real for most brands. There are exceptions, but any LED that advertises Lumens as a selling point is directly telling lies in hopes of better sales. What else are they lying about?

http://plantphys.info/plant_physiology/light.shtml
The first illustration in this link shows 555 nm (Lumens) as falling at the interface of green and yellow, not an effective frequency for plant growth and not a high intensity frequency used in LED growlights.
The article is an interesting overview of plants and light.

 

[Deadphish1965]

Thanks for the info

 

[Boyd Crowder]

you can fit the vent stuff up top
if you gonna grow in this space horizontally use a 400w hps or an equivelent 4-600w draw led & try and get one shaped like your room if you go led

 

[Deadphish1965]

Thanks