"
Recommended height above canopy: 30"-48"; Amare
does not recommend to place the COB panel less than 30" above the canopy with lenses installed."
We will use the 36" numbers to get the PPFD since thats one of the only "usable" number they give you. for a
4x4 that would be 905PPFD (not bad) and a
5x5 would be 579PPFD... so a bit better than a DE HPS. ( Not great IMO)
Im aware about the efficiency, but I still dont think that monos are worth it.. Ive never seen anything that says otherwise except peoples opinions.. as for the cobs.. its all about the PPFD which is why they rock... obviously spectrum is a big part of that but raw output is also still good since it is white light... Yes more blue less red or vice versa but its white either way you look at it. You can make a 400W 660mn light for like $400 thats driven at 50W each (half the rated power) and 8 5000k crees around $1200 total... boom over 1000W of light blasting with a solid red for flower... But that said
@The Dawg is doing great with his 5000k and a bit of far red for a short amount of time.
If youre interested Ill run one of those lights to test how they fair... But I dont think theyre worth the money by far because they dont has a good spread of light for the area compared to the DIY. For instance... This would be that light assuming it was just the cobs in a 4x4.
I would guess at best the COBS are in one of these configs... Both of which are not impressive to me. If you know the specific config I would like to see the output as thats not found anywhere.... Only PPF which like I said does come down to multiplying the total by the meters^2 to get PPFD.
I have readings in my signature (DE HPS, HPS, and COBS) to compare if you have some for your light I would like to see them.
CXB3590CD36V3500K 4 COBS @2.8A ON 1.813 PROFILE HEATSINK
16 SQ.FT. CANOPY 92% EFFICIENT DRIVER @15 CENTS PER KWH
Total power watts at the wall: 452.17
Cobs power watts: 416
Total voltage forward: 148
Total lumens: 58144
Total PAR watts assuming 10% loss: 162
Total PPF: 753.3
PPFD based on canopy area: 506.78
PAR watts per sq.ft.: 10.13
Cob efficiency: 43.14%
Power watts per sq.ft.: 26.0
Voltage forward per cob: 37.12
Lumens per watt: 139.77
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 237
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 282 inches
Heatsink length active cooling @40cm^2/heatwatt: 94 inches
COB cost dollar per PAR watt: $1.18
Electric cost
@12/12 in 30 days: $24.92
Electric cost @18/6 in 30 days: $37.13
Cost per cob: $47.62
Heatsink cost per inch cut: $0.66
Total cobs cost: $190
Total heatsink passive cooling cost: $186
Total heatsink active cooling cost: $62
CXB3590CD36V3500K 4 COBS @1.4A ON 1.813 PROFILE HEATSINK
16 SQ.FT. CANOPY 92% EFFICIENT DRIVER @15 CENTS PER KWH
Total power watts at the wall: 211.96
Cobs power watts: 195
Total voltage forward: 140
Total lumens: 35595
Total PAR watts assuming 10% loss: 99
Total PPF: 460.35
PPFD based on canopy area: 309.7
PAR watts per sq.ft.: 6.19
Cob efficiency: 56.34%
Power watts per sq.ft.: 12.19
Voltage forward per cob: 34.89
Lumens per watt: 182.54
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 85
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 101 inches
Heatsink length active cooling @40cm^2/heatwatt: 34 inches
COB cost dollar per PAR watt: $1.92
Electric cost
@12/12 in 30 days: $11.95
Electric cost @18/6 in 30 days: $17.67
Cost per cob: $47.62
Heatsink cost per inch cut: $0.66
Total cobs cost: $190
Total heatsink passive cooling cost: $67
Total heatsink active cooling cost: $22