GroErr Grows...

GroErr

GroErr

Well-Known Member
Roger A. Shrubber said:
these guys brought up an interesting point about reflectors/lenses

https://www.rollitup.org/t/lens-and-reflector-optics-for-cob.893660/page-19#post-13031486
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Olive Drab Green said:
I don't understand how it'd be 20% less. The emitter's still bare, it just has a collar to direct light. I also don't keep it any higher than you would bare.
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I've read about loss with both but I don't buy 20%, would be easy enough to notice in a test if there were that much difference. There may be some minimal loss but I do like the reflectors for focusing light, no different than a hood really. Lenses are more like having them bare but how much loss will depend on the design. I think there's a thread dedicated to these and there would be some better than others.

I do agree that to get the most light bare is probably the best, just not sure it's enough of a difference to be concerned about.
 
ttystikk

ttystikk

Well-Known Member
GroErr said:
I've read about loss with both but I don't buy 20%, would be easy enough to notice in a test if there were that much difference. There may be some minimal loss but I do like the reflectors for focusing light, no different than a hood really. Lenses are more like having them bare but how much loss will depend on the design. I think there's a thread dedicated to these and there would be some better than others.

I do agree that to get the most light bare is probably the best, just not sure it's enough of a difference to be concerned about.
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No, LENSES ARE BEST because even with their 5% penalty they focus and direct the light output to where it's supposed to go much better than the other options. Reflectors test relatively poorly in this regard and bare chips are worse.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
ttystikk said:
No, LENSES ARE BEST because even with their 5% penalty they focus and direct the light output to where it's supposed to go much better than the other options. Reflectors test relatively poorly in this regard and bare chips are worse.
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Not saying I don't trust your understanding, but I'd say my plants are looking pretty good. I also run each of my COBs at 2150mA.
What do you guys run yours at?
 
ttystikk

ttystikk

Well-Known Member
Olive Drab Green said:
Not saying I don't trust your understanding, but I'd say my plants are looking pretty good. I also run each of my COBs at 2150mA.
What do you guys run yours at?
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I run my 72V chips at 700ma, or 54W with the dimmer circuit open.

There are lots of ways to skin cats and herd photons. Y'all were asking about the best approach and that's lenses. The fact that your lights work well is more of an indicator that you have plenty of light than that it's being directed with particular efficiency.

Final point; I'm not here to split hairs or bust balls. Obviously each of these approaches works and I'm not going to say they're crap. Making the perfect the enemy of the good enough is a dangerous and seductive trap.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
ttystikk said:
I run my 72V chips at 700ma, or 54W with the dimmer circuit open.

There are lots of ways to skin cats and herd photons. Y'all were asking about the best approach and that's lenses. The fact that your lights work well is more of an indicator that you have plenty of light than that it's being directed with particular efficiency.

Final point; I'm not here to split hairs or bust balls. Obviously each of these approaches works and I'm not going to say they're crap. Making the perfect the enemy of the good enough is a dangerous and seductive trap.
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I was just asking, bro. I think my fixtures are run higher than most others, I was just wondering if I figured correctly.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
ttystikk said:
No worries. To know how hard you're running your chips, we need to know their max wattage vs the wattage you're pulling. To get watts we need to know both current and voltage.
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3600mA max rating. 36v chip. 3500k, 80CRI. CXB3590, CD/Top Bin. Driven at 2150mA. One emitter per driver. Two fixtures total. 89w with fan and driver included. I suspect 78w-80w for the emitter at max.
 
GroErr

GroErr

Well-Known Member
ttystikk said:
I run my 72V chips at 700ma, or 54W with the dimmer circuit open.

There are lots of ways to skin cats and herd photons. Y'all were asking about the best approach and that's lenses. The fact that your lights work well is more of an indicator that you have plenty of light than that it's being directed with particular efficiency.

Final point; I'm not here to split hairs or bust balls. Obviously each of these approaches works and I'm not going to say they're crap. Making the perfect the enemy of the good enough is a dangerous and seductive trap.
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I haven't researched or done enough tests to say one way or another but the highlighted point you made above is along the same lines as my comment about not enough loss/gain in any scenario to worry about it. As long as you have enough output for the footprint they should do well. The protection from dust/scratches in my case from dust would have me lean towards the lenses and probably a bigger factor/weight than any gain or loss from using them.

Edit: The reflectors by the way are a pain in the ass, I've knocked a couple off and broken one hitting the damn things when watering, they're pretty flimsy. I'd imagine the lenses are a little better for that too.
 
GroErr

GroErr

Well-Known Member
Javadog said:
I would add that plants tend toward the light and, left alone,
will tend to fill in the spaces where the light is distributed.

I broke the diffuser on one of my Kessil 350s....I call it my
Frost Gun now....lol.....
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Absolutely, it's funny how they fill whatever space you give them if there's enough light hitting them. Enjoy your frost gun - lol
 
GroErr

GroErr

Well-Known Member
Had been checking and double checking those 4x BPP's as I had a feeling one was male and he finally showed some balls ;)

Pulled him yesterday no harm done, very early. Replaced him with a small Blue Pyramid I had an extra clone of. Up-potted it into a big 1gal container and stuck it on a coffee can for a bit of a lift. This is a 7 week pheno and even pulling it at 6 weeks when I ran it from seed it's dank tangerine hash :) Want me some of that fully matured and it'll finish by new year's.

I have a clone of this male I'll flower out later if needed, this one got to about 30" so it's too tall to flower in the small tent and don't want to fire up that tent for one male right now.

BPP1-Male-1.JPG
BPP-Male-2.JPG

Cheers :bigjoint:
 
ttystikk

ttystikk

Well-Known Member
GroErr said:
I haven't researched or done enough tests to say one way or another but the highlighted point you made above is along the same lines as my comment about not enough loss/gain in any scenario to worry about it. As long as you have enough output for the footprint they should do well. The protection from dust/scratches in my case from dust would have me lean towards the lenses and probably a bigger factor/weight than any gain or loss from using them.

Edit: The reflectors by the way are a pain in the ass, I've knocked a couple off and broken one hitting the damn things when watering, they're pretty flimsy. I'd imagine the lenses are a little better for that too.
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Yeah, we're on the same page here. Plenty of light is plenty of light!

I got lenses on my COBs because my vertical setup basically forces me to rub against them while tending my girls. Thus durability was the main reason for me, the control of light was a nice bonus and I can definitely see the results.

Lenses FTW!
 
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