540w of TastyLED, 4x4 tent, 8 plants = 1 pound yield

Rahz

Rahz

Well-Known Member
4 T2-2100s or 2 T4-2100s would light a 2x8 well. The total weight of either will be about 32 pounds so if you're thinking about being able to raise them together that would need to be considered. My DIY light weights about 50 lbs. and it's all I can do to lift one side above shoulder level.

coughphee.connoiseur said:
So i was wondering @Rahz, what do you think if one had (4) t2-2100's and needed it to cover a 2x8 area, but wants to place all the fixtures on a bar rail so that one could just hang it like one big fixture whats your take on that?

Was thinking maybe a heatsink just about 7-8ft long or (2) heat sinks 3-4ft long.

Any good ideas one this one out there?
Click to expand...
 
coughphee.connoiseur

coughphee.connoiseur

Well-Known Member
Rahz said:
4 T2-2100s or 2 T4-2100s would light a 2x8 well. The total weight of either will be about 32 pounds so if you're thinking about being able to raise them together that would need to be considered. My DIY light weights about 50 lbs. and it's all I can do to lift one side above shoulder level.
Click to expand...
Please excuse as i meant (4) T1-2100... i tested it out with 3 of them works pretty well, par meter was showing between 1000-1100 about a foot or so from the light.

Thanks for the input, now i need to configure a design. How much would you charge for your consultancy ?
 
Rahz

Rahz

Well-Known Member
Grow space design is fun, no charge.

A 3500K CXB3590 at 2.1 amps provides 475 PPFD in a 2x2 area. It's on the low side of flowering intensity but if the results meet your expectations it's not a bad thing. Having the lamps individually adjustable would be a good thing I think.
 
coughphee.connoiseur

coughphee.connoiseur

Well-Known Member
Indeed 475 PPFD is on the low side for the bloom stage. The area to be covered is already getting over lap from (2) D/E fixtures, when running the par meter over the area I'm getting good numbers so the 475 is actually just enough if not over kill.

Very true i agree, being able to adjust accordingly is essential, I took that in consideration, i would want to make this adjustable if possible i was going to run it by a tech to see what we could come up with if its feasible.

Can i PM u ?
 
Hybridway

Hybridway

Well-Known Member
Rahz said:
The T4-2100 is a 300w watt light. It's new and hasn't hit the website yet but will be showing up soon. That will be the most wattage I will put on a single bar. 690 PPF each. Hmm... the price on them is also 690. Same trend holds with the T3. A dollar per PPF. That's my motto :)

Anyone is free to suggest whatever lights they like but if I see a direct comparison that seems unfair it's in my interest to say something. OTOH I generally let the lights sell themselves so perhaps I shouldn't worry about it so much. Either way, nothing personal and thanks for the compliments.
Click to expand...
At what distance do you take these Par measurements? Suggested grow hight? Thanks!
Wasn't really making any comparisons. Grow lights for a 5'x9' are grow lights for a 5'x9' no matter how you slice it.
 
Rahz

Rahz

Well-Known Member
I don't try and turn par measurements into PPF/PPFD. I have an SQ-520 I will be using for performance comparisons but it will not be replacing the calculations. 3590 3500K CD at 2.1 amps being 2.3 umol/j and 75 watts, 172.5 PPF x 4 emitters = 690.

a 75 watt cob can be placed as close as 12" for established plants but 14-15" will give a better spread in a 2x2 reflective area.
 
Hybridway

Hybridway

Well-Known Member
Rahz said:
I don't try and turn par measurements into PPF/PPFD. I have an SQ-520 I will be using for performance comparisons but it will not be replacing the calculations. 3590 3500K CD at 2.1 amps being 2.3 umol/j and 75 watts, 172.5 PPF x 4 emitters = 690.

a 75 watt cob can be placed as close as 12" for established plants but 14-15" will give a better spread in a 2x2 reflective area.
Click to expand...
So, at what hight do you take the measurement to determine your 690 output? Because that is how you maintain your motto right? It must be s consistent formula ? Not just adding output from each emitter as that's irrelevant to the fixture.
 
Rahz

Rahz

Well-Known Member
As I said, I don't take measurements to determine the PPF. 3500K CD at 2.1 amps provides 75 watts and 50% efficiency (2.3 umol/j) 75 x 2.3 = 172.5 PPF. I was just kidding about it being my motto. I had just realized the price and PPF were the same and thought it was amusing, but yes if one emitter provides 172.5 PPF then 4 will provide 690 PPF. I'm not sure why you think the total PPF would be irrelevant as it represents the total photon output of the lamp.
 
OneHitDone

OneHitDone

Well-Known Member
Hybridway said:
So, at what hight do you take the measurement to determine your 690 output? Because that is how you maintain your motto right? It must be s consistent formula ? Not just adding output from each emitter as that's irrelevant to the fixture.
Click to expand...
690 is the total horse power photon count, not the par reading at any given spot below the light
 
You must log in or register to reply here.
Top