All COB Users - Lettuce Grow Challenge!!

white light = more lurnens per w..we find they are basically just as good and easier on the eyes..but r and b are no slouch

need more light?...lower them or add more[nice setup]

not British
 
so i found a solution to my adding more light, plus keeping airflow situation.

http://www.homedepot.com/p/Veranda-...yl-Classic-Diamond-Lattice-73004026/100011154

it takes my light from about 13500 lx to 19000 lux,

so im going to try to do math here, if someone sees a flaw in this, please correct me.

Im going off the formula that LX x .014505 = umol

Pre lattice = 13500 lx
umol = 195.81
mol = 16.91
mol /hr = .704
mols needed = 16
lights on for 23 hours a day

post lattice = 19000 lux
umol 275.5
mol = 23.8
mol /hr = .991
mols needed = 16
lights on for 16 hours a day.

lights at the wall are 405 watts
Lattice cost me $20
I can keep the lights off for an additional 7 hours a day or 2555 hours a year
kw saved = 1034.75
power is .10 kw
cost saving = $103.47
 
muleface said:
so i found a solution to my adding more light, plus keeping airflow situation.

http://www.homedepot.com/p/Veranda-...yl-Classic-Diamond-Lattice-73004026/100011154

it takes my light from about 13500 lx to 19000 lux,

so im going to try to do math here, if someone sees a flaw in this, please correct me.

Im going off the formula that LX x .014505 = umol

Pre lattice = 13500 lx
umol = 195.81
mol = 16.91
mol /hr = .704
mols needed = 16
lights on for 23 hours a day

post lattice = 19000 lux
umol 275.5
mol = 23.8
mol /hr = .991
mols needed = 16
lights on for 16 hours a day.

lights at the wall are 405 watts
Lattice cost me $20
I can keep the lights off for an additional 7 hours a day or 2555 hours a year
kw saved = 1034.75
power is .10 kw
cost saving = $103.47
Click to expand...
Very cool!
 
20W Osram Parathom is bright as fuck, eye hurting already with the diffuser on.

Couldn't pull/twist the diffuser off so used a hacksaw which was a bother.
Going to use cutting pliers next time.

Getting time to germinate the pepper seeds.
 
OLD MOTHER SATIVA said:
i do not understand...how is a lattice gonna increase light intensity...diffusion?
Click to expand...

The lattice is white vinyl, its going behind the lights to act like a reflector. The lights are currently spaced about 8 inches apart and are shining down on more white plastic, so i'd guess it kind of acts like the walls of a grow tent.
 

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do you think its because it is rereflecting light bouncing from the white below..the light from the tubes doesn't
wrap around far enough to hit the lattice does it
 
yeah, i guess. truth be told, i just happen to be putting some wrapping paper away in the basement, and thought, i wonder if i put this white side down over my lights if my lux meter will read higher. It did. so then I tried to find a way to replicate that. The white side of the wrapping paper actually did a better job, however it blocked the airflow.
 
muleface said:
yeah, i guess. truth be told, i just happen to be putting some wrapping paper away in the basement, and thought, i wonder if i put this white side down over my lights if my lux meter will read higher. It did. so then I tried to find a way to replicate that. The white side of the wrapping paper actually did a better job, however it blocked the airflow.
Click to expand...
Good job thats a great idea.
 
@OneHitDone You're right the Philips lights are garbage. Fuck I don't believe it.

Eating-Words.jpg
 
OneHitDone said:
Wait, what did I miss Grasshopper? lol
Click to expand...
I have a par meter, three philips lights read around 80 umol m2 s
The four bridgelux strips I have at the same height measure 380... seriously wtf. That's horrible.

I mean, good for us, the bridgelux are cheap and output a lot of light, but wow the philps.. so poor.

I know of a guy that just bought 1 million dollars of philips to go over something like 6 or 60 hectares in his greenhouse. yikes

Back to the bridgelux, I'm thinking if 4 of them over a 2' x 4' space are reading over 350 umol, that's way too much for greens is it not? I'll find out I guess - what a good value $200CDN for that much light. I love it.
 
PicklesRus said:
I have a par meter, three philips lights read around 80 umol m2 s
The four bridgelux strips I have at the same height measure 380... seriously wtf. That's horrible.

I mean, good for us, the bridgelux are cheap and output a lot of light, but wow the philps.. so poor.

I know of a guy that just bought 1 million dollars of philips to go over something like 6 or 60 hectares in his greenhouse. yikes

Back to the bridgelux, I'm thinking if 4 of them over a 2' x 4' space are reading over 350 umol, that's way too much for greens is it not? I'll find out I guess - what a good value $200CDN for that much light. I love it.
Click to expand...

i need to fill a space that is about 30 inches by 58 inches. Will you create me a bridgelux design for this? I am going to grow squash, and cucumbers. Why you ask? I like squash...

also, if you guys don't use this for shopping parts you should...

https://www.findchips.com
 
Last edited:
i can't find anything on this subject at all. This is going to be a huge crap shoot. But squash does love the sun, i'd base it on tomatoes/can needs.

i was thinking 6 x 6 foot long 3500k strips (so a 2 foot and a 4 foot)
 
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