my home built samsung LTQB22A unit, is it too powerful?

[shimbob]

Got a cheapo lux meter coming in the mail for some cheapo measurements.

Well I'm totally perplexed. Cheapo lux meter came (Pyle PLMT15), and it measured the following:
At 15" it was 34.6k lux
12" 38k
8" 43.3k
6" 47.3k
3" 49.8k

So using the conversion factor of 69lux/ppfd, that means at 3" it's 720ppfd.

 

[Bookush34]

I am running 550watts COBs in a 3x3.
That’s 61watts per sq/ft.
I run them 10” away without issue.

That’s with no reflector on.

With the reflectors on it will burn some mature plants at 18”- 20”

 

[TheGreatSouthern]

that hurt jeez i may have to go see someone only you would back up a child fucker hand down for you great job so how many family members you lose in 9/11 ?

Yeah nah sorry matey sounded like I trolled you a bit there. forgot to add the winky smiley face at the end or something. It's my job to pay you out, says so in the first line of the national anthem. Rest assured my comment was made with tongue firmly implanted in cheek and dick firmly implanted in sheep.

 

[TheGreatSouthern]

Well I'm totally perplexed. Cheapo lux meter came (Pyle PLMT15), and it measured the following:
At 15" it was 34.6k lux
12" 38k
8" 43.3k
6" 47.3k
3" 49.8k

So using the conversion factor of 69lux/ppfd, that means at 3" it's 720ppfd.

forget the cheapo lux meter. my understanding (which may be wrong) is those things aren't meant for leds, as the leds we use have so little green in them you need a PAR meter, which puts more value on the blue and red than the green it detects and spits out a more accurate value in PAR watts. successive generations of PAR meters have become more and more accurate as developers understand better just how much energy in which parts of the spectrum are most efficient for plant growth. you probably know all this or maybe it's all just BS, but the bottom line is once you go from HPS to LED that lux meter goes in the trash.

 

[ANC]

I've got a lux meter, but to be honest I don't think it's even worth using given how little green there is in the 4000K lm301b. I'd love a PAR meter but it's one of those things I would pay a fortune for, use once or twice till I could accurately estimate the energy at the canopy and not use till the next time I built a light with different chips in it. I think you guys are right, I've had these things turned up too high or got them too close or both. I've turned them down to 200W. I'll prune back all the bleached leaves today and see if the new growth is happy and healthy. Thanks heaps for the tip.

Some aquarium shops rent them out

 

[dandyrandy]

I've found with my 16 cob setup I can check the tops of the colas with an ir thermometer. I've had foxtailing issues running a nice cool ~ 81 degrees on two thermometers hanging 16" below the cobs. But I saw 98° hot spots on those buds. Since then Ive backed down to ~50 watts sq ft and I leave around 24" clearance. Check the bud temps.

 

[ANC]

The catch is how low the PAR values are over large areas of the grow using 1000W HPS rigs.

 

[jarvild]

I hear all you talking watts sq.ft which from my experience doesn't work well with led's. That's going to depend on par wattage produced in spectrum.
I run my wattage low in veg and flower and can produce a pound+ running 22-24 watts sq. ft.

 

[shimz]

and if u were to replace that with hps imagen how much better they would of looked

These replaced 840W of CMH and 600W of HPS before that. Same result, 1/2 the electric cost. Thanks for playing.

 

[Ryante55]

I hear all you talking watts sq.ft which from my experience doesn't work well with led's. That's going to depend on par wattage produced in spectrum.
I run my wattage low in veg and flower and can produce a pound+ running 22-24 watts sq. ft.

How big is the space? If that lb is in a 3x3 that would be impressive if your in a 4x4 or bigger a lb isn't very good

 

[shimbob]

Some aquarium shops rent them out

Rushed to my local aquarium shop upon learning this, they only have the hydrofarm junk

 

[jarvild]

How big is the space? If that lb is in a 3x3 that would be impressive if your in a 4x4 or bigger a lb isn't very good

3x4

 

[Moflow]

Rushed to my local aquarium shop upon learning this, they only have the hydrofarm junk

That'll do the job

 

[jarvild]

How big is the space? If that lb is in a 3x3 that would be impressive if your in a 4x4 or bigger a lb isn't very good

 

[rob333]

These replaced 840W of CMH and 600W of HPS before that. Same result, 1/2 the electric cost. Thanks for playing.

1/2 the electric bill sure sure you mean 73 cents ?

 

[rob333]

Yeah nah sorry matey sounded like I trolled you a bit there. forgot to add the winky smiley face at the end or something. It's my job to pay you out, says so in the first line of the national anthem. Rest assured my comment was made with tongue firmly implanted in cheek and dick firmly implanted in sheep.

like how you don't address the fact that you are baking up a child fucker do u guys share images via pm ?