Mau5Capades: builds & grow journal
- Thread starter Growmau5
- Start date
GreenSanta
Well-Known Member
good question flexy I am wondering the same thing, I am alternating 3k and 4k units and I like to think they a fuller spectrum but I dont know... Thanks for clearing this up someone
SupraSPL
Well-Known Member
One way to compare each build, use efficiency as a measure of performance and evaluate each build by $/PAR W with drivers/reflectors/heatsink cost included. Then just pick your favorite, scale it up to cover your space at your target PPFD.
These prices assume HLG-185H-C A version drivers adjusted to maximum current, 3.5"X42" active cooled heatsinks, ideal holders + Kingbrite reflector adapters and reflectors:
3070 Cutter and Kingbrite price $32 ea
3070 @ 26W ea = 57.5% = $3.31/PAR W
3070 @ 39W ea = 53% = $3.07/PAR W
3070 @ 54W ea = 49.7% = $2.69/PAR W
3590 Kingbrite price $46 ea
3590 @ 25.4W ea = 63.5%, $3.99/PAR W
3590 @ 38W ea = 60.2%, $3.24/PAR W
3590 @ 53W ea = 55.3%, $2.76/PAR W
3590 Cutter price $42.15 ea
3590 @ 25.4W ea = 63.5%, $3.75/PAR W
3590 @ 38W ea = 60.2%, $3.08/PAR W
3590 @ 53W ea = 55.3%, $2.62/PAR W
Is this analysis is correct, the 3590 significantly beats the 3070 in every case. This was using top bins in every case. Using Cutter's pricing puts it even more in favor of 3590.
Vero29 3500K V2 - Digikey price $27.50, using HLG-185H-36A
Vero29 @ 51.7W ea = 43% = $2.80/PAR W
Vero29 3500K V2 - Digikey price $27.50, using HLG-320H-36A
Vero29 @ 92.8W ea = 39.5% = $2.24/PAR W
These prices assume HLG-185H-C A version drivers adjusted to maximum current, 3.5"X42" active cooled heatsinks, ideal holders + Kingbrite reflector adapters and reflectors:
3070 Cutter and Kingbrite price $32 ea
3070 @ 26W ea = 57.5% = $3.31/PAR W
3070 @ 39W ea = 53% = $3.07/PAR W
3070 @ 54W ea = 49.7% = $2.69/PAR W
3590 Kingbrite price $46 ea
3590 @ 25.4W ea = 63.5%, $3.99/PAR W
3590 @ 38W ea = 60.2%, $3.24/PAR W
3590 @ 53W ea = 55.3%, $2.76/PAR W
3590 Cutter price $42.15 ea
3590 @ 25.4W ea = 63.5%, $3.75/PAR W
3590 @ 38W ea = 60.2%, $3.08/PAR W
3590 @ 53W ea = 55.3%, $2.62/PAR W
Is this analysis is correct, the 3590 significantly beats the 3070 in every case. This was using top bins in every case. Using Cutter's pricing puts it even more in favor of 3590.
Vero29 3500K V2 - Digikey price $27.50, using HLG-185H-36A
Vero29 @ 51.7W ea = 43% = $2.80/PAR W
Vero29 3500K V2 - Digikey price $27.50, using HLG-320H-36A
Vero29 @ 92.8W ea = 39.5% = $2.24/PAR W
yes very good point. the 3500K cree might one of the best cree cxb base spectrum for flowering. but can't commit until I see an SPD.
BobCajun
Well-Known Member
BobCajun
Well-Known Member
Doesn't seem to matter much really. Lower CCT means less efficiency but more red spectrum, pretty much cancels out. You would probably get somewhat stretchier plants with lower CCTs. Sunlight itself is 4870k and I find 4000k to work fine and be a normal looking white color. It's called neutral white. I don't think anyone ever did side by side experiments to determine difference in dry weight of the various spectrums of COBs. I find the warm whites too orange for my liking and I read an article that showed that cool and neutral whites are often better, depending on species. Radishes did best with neutral.
wietefras
Well-Known Member
It's already difficult if not impossible to make back the investment on CXB3070's running at 1.4A for an increase in efficiency of 20% to 30% over a top of the line HPS. Let alone almost doubling the costs by running them at 0.7A for an added 13% increase of led efficiency.
J Bleezy
Well-Known Member
Thanks mau5 and everyone for all of this info. I'll be reading this thread (and several others) over and over as I have never tried anything like this and I'm thinking I'd like to give it a shot.
First of many Q's,I'm sure and please forgive me for my noobness.
Where can I buy the cxb's? I've tried googling it a few different ways, but it's always the same results. The ones that come up look like they're already wired inside a fixture and cost $350 and up?
Thanks in advance
First of many Q's,I'm sure and please forgive me for my noobness.
Where can I buy the cxb's? I've tried googling it a few different ways, but it's always the same results. The ones that come up look like they're already wired inside a fixture and cost $350 and up?
Thanks in advance
BobCajun
Well-Known Member
Since I mentioned earlier about using a repeating 3/3 light cycle for vegetative growth I thought I may as well show this image of the results after 2 weeks. Growth seems to be healthy and plants remained stocky, plus power was saved due to only using 12 hours per day. These were topped right after rooting and not again.
dionysus4
Well-Known Member
especially once u put 4 on a HLG-240H-C1750
J Bleezy
Well-Known Member
I'm asking Q's that are answered in the videos lol sorry.
As I said I'll be doing a lot of reading to avoid being too annoying, but it's just so much new info to me.
DISTRESS0R
Active Member
all good man i feel the same way. These videos covers everything of the basics except how to best mount your light for hanging
I just saw an spd provided by GG of the 3500k, its what I was hoping for. Similar to 3K except a tiny bit more blue. Most importantly the peak near 600nm stayed in the same place.
bassman999
Well-Known Member
Confirms what was said that just less phosphor was used not different fomula
who said that?
Stephenj37826
Well-Known Member
Sounds plausible for sure.
bassman999
Well-Known Member
I think Maybe Supra not sure, it was in another thread
BobCajun
Well-Known Member
If I was buying cobs I'd be getting cool whites now, after the article I linked earlier, actually twice because the first post didn't show up at the time due to forum issues. What they found was that a blue percentage of about 25% had best results, which is cool white. They found that with that level there was enough for normal growth even at low PPF of 200, meaning shaded parts or ones in lower light zones of the space. Oddly, the neutral whites, 4000k, worked slightly less well than either warm or cool whites. Seems to be a trough at about 17% blue.
ttystikk
Well-Known Member
I got 3500k based on the advice of many here who said that an exact spectrum wasn't critical and that people had good results with them.
BuddyColas
Well-Known Member
A 3/3 light schedule is new to me. Your girls sure look healthy. A couple a questions. So you will be running 3/3 until you go 12/12? And if you were doing a build today you would go with 5000K COBs exclusively?
I am wading thru that article you referenced (gotta pay my dues), and what are the “take aways” you got from that article?
Thanks.
Abiqua
Well-Known Member
The sun does not have a static Kelvin temp.
ttystikk
Well-Known Member
Yes it does. Perceived changes are entirely due to the influence of atmospheric conditions, such as the angle at which sunlight is passing through it, airborne contaminants, etc.
gee that's a bit literal (or should I say ana...). at the plant canopy it is far from static,
Abiqua
Well-Known Member
that is exactly why conditions are never static with sunlight...
nogod_
Well-Known Member
I couldn't find the part of the article where they grew cannabis
The real trials are happening right now..
all around you....
too early to tell....
too close to call....
pretty sure realstyles just bought some 5600K cxb3590s. Maybe slightly indica dominant hybrids @ 76°F will love it more than 6500K. We'll just have to wait and see!
The real trials are happening right now..
all around you....
too early to tell....
too close to call....
pretty sure realstyles just bought some 5600K cxb3590s. Maybe slightly indica dominant hybrids @ 76°F will love it more than 6500K. We'll just have to wait and see!
ttystikk
Well-Known Member
Calling an engineer anal is considered a compliment.
Quite right; I think the biggest influence is the fact the sun moves across the sky.
My other gripe is with people invoking spectrum as justification for continuing to use hps and/or mh lamps. There are better options for both if spectrum is really their concern.