Cree cxb3590 lens help
- Thread starter Nappy420
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Stephenj37826
Well-Known Member
Lenses or reflectors. Reflectors would be more efficient.
Stephenj37826
Well-Known Member
Reflectors
Cool thanks for ur help
EfficientWatt
Well-Known Member
Well .. that's quickly said (!) It's not that easy if you look in deeper ...
=> Relfectors will have less light loss than lens, as far as total light being emited, so true there.
.. but lens have better spread within the zone (no excess light in the center, better spread inside the focal area ..)
So lens could just as well be more efficient in terms of getting the light evenly accross your plants ... and therefore be more efficiently used by your plants for photosynthesis.
and lets not forget that where with reflectors, your cobs could get dirty over time from not being protected, with lens, just a quick clean of 'em and it's all as good as new ...
EDIT : Reflectors supposedly have more difuse light, that's a +
=> Relfectors will have less light loss than lens, as far as total light being emited, so true there.
.. but lens have better spread within the zone (no excess light in the center, better spread inside the focal area ..)
So lens could just as well be more efficient in terms of getting the light evenly accross your plants ... and therefore be more efficiently used by your plants for photosynthesis.
and lets not forget that where with reflectors, your cobs could get dirty over time from not being protected, with lens, just a quick clean of 'em and it's all as good as new ...
EDIT : Reflectors supposedly have more difuse light, that's a +
Stephenj37826
Well-Known Member
Well he also mentioned weight so I figured reflectors for the win in this situation. That being said my panels will be using lenses. The small diffrence between the two probably wouldn't be noticeable to most growers anyways.
Both of u guys have a good point let me futher explain y i ask i was planning on building 3 foot light bar for a 4x7 i was going to 6 going across it so with the refector will i get light the extra foot or should i do a 4 foot bar with 4 cobs instead of 3 and with those 90 lens i figured i would get more pentatraion in my plants
Stephenj37826
Well-Known Member
I'd do 4 foot bars with 4 cobs and 1 driver per bar. Leave them independent as to get the best coverage. Check out gromau5s thread
Thats,kinda where i got my ideal but the heatsink he is using is a 36x5.886 with the refectors at the end
Stephenj37826
Well-Known Member
Even though your heat sinks are 48 I'd put them in 4-6 inches from the ends in a 4 foot deep grow area
7x7 but cut down to a 4x7 right now no just woundering if i do a 36 inch heatsink will i get light to the edge or will a lens help or should i just do a 48 inch heatsink and have an extra cob on the end to make 4 instead 3 i can have 4 with my driver but i wanted to keep all my sinks at 36 so i can 2 rows when i open up the other side up and make a 6x6 light pannel pretty much
Stephenj37826
Well-Known Member
What drives ?
Stephenj37826
Well-Known Member
That question is subjective to me. So if it was me I'd do 1 driver per bar and 4 cobs . Dim if I saw fit. At 1400ma 1 36v cxb3590 35k cd bin puts out roughly 128 ppf each. So if you wanted 800 ppfd then each cob would cover about 1.72 sq ft. Before lense/reflector loss.
im using the 72v cause i run 220 i dont no if that matter when running those numbers
SupraSPL
Well-Known Member
It am convinced that a reflector is a big improvement over bare COBs, especially if they are 50W ea or higher, but I am still undecided between lens and reflector. Technically you could call a reflector a scatterer because the light that hits it is sent in all directions and some of that light will miss the canopy. Lenses do that to some extent as well, but they have a sharp cutoff so you have the control to put the light exactly where you want it. The downside, standard lenses tax the entire output by about 10%. I plan on doing some more testing to try and nail down which is truly better, but for now I have been using both lenses and reflectors on the edges of the canopy and still running the bare in the center of the canopy. If we could get AR coated lenses for a fair price I suspect that would make lenses the clear winner.
EfficientWatt
Well-Known Member
Sorry, AR is .. ?
*** getting ready to cough and say of course***
EDIT : Anti reflection (?) refraction ?
*** getting ready to cough and say of course***
EDIT : Anti reflection (?) refraction ?
Stephenj37826
Well-Known Member
Use hlg 185h c700 instead if using 72 volt
SupraSPL
Well-Known Member
Yep Anti Reflecive coating is what we are after. If done correctly it should reduce the lens losses from 10% to about 2-3%. If we can get lenses with low iron glass that could reduce lens losses to 1% (allegedly). It would be relatively easy to verify the actual gains by testing with PAR meter or lux meter. When I order glasses from Zenni they offer AR coating for an extra $5 and it does make a noticeable difference when compared with glasses that do not have AR coating.