Astir Grow Led Panel Project...

MrFlux

MrFlux

Well-Known Member
Richelsdorfite I am amazed how well it agrees with each other. Looking very good :-P

SupraSPL said:
I am shocked that the XPE2 blue (470nm?) can reach those levels of efficiency.
Click to expand...
Yes it's the 470nm. It did look too good to be true, and of course it was. The forward voltage should be 3.1 and not 2.9 giving an efficiency of 60.9% (LER is unchanged).

I was curious to see how well modern color emitters perform relative to each other so I did all of the XP-E2 colors:
cree-xpe2-colors.png
Green is still very weak, amber too. Good thing we have whites covering those. Here's the data:

Code: 
XP-E2 Royal Blue
Power in        : 1.08 W (3.10V x 0.35A)
Luminous flux   : 21.5 lumen
Efficacy        : 20 lumen/W
LER             : 37 lumen/W
Radiometric eff.: 52.9%
Radiant flux    : 0.57 W
Photon flux     : 2.18 umol/s (2.01 per Watt)
Blue            : 95% power, 96% flux
Red             : 0% power, 0% flux


XP-E2 Blue
Power in        : 1.08 W (3.10V x 0.35A)
Luminous flux   : 45.7 lumen
Efficacy        : 42 lumen/W
LER             : 69 lumen/W
Radiometric eff.: 60.8%
Radiant flux    : 0.66 W
Photon flux     : 2.58 umol/s (2.38 per Watt)
Blue            : 83% power, 84% flux
Red             : 0% power, 0% flux


XP-E2 Green
Power in        : 1.12 W (3.20V x 0.35A)
Luminous flux   : 122 lumen
Efficacy        : 109 lumen/W
LER             : 512 lumen/W
Radiometric eff.: 21.3%
Radiant flux    : 0.24 W
Photon flux     : 1.05 umol/s (0.94 per Watt)
Blue            : 1% power, 1% flux
Red             : 0% power, 0% flux


XP-E2 Amber
Power in        : 0.77 W (2.20V x 0.35A)
Luminous flux   : 80.6 lumen
Efficacy        : 105 lumen/W
LER             : 489 lumen/W
Radiometric eff.: 21.4%
Radiant flux    : 0.16 W
Photon flux     : 0.82 umol/s (1.06 per Watt)
Blue            : 0% power, 0% flux
Red             : 1% power, 1% flux


XP-E2 Orange red
Power in        : 0.77 W (2.20V x 0.35A)
Luminous flux   : 93.9 lumen
Efficacy        : 122 lumen/W
LER             : 245 lumen/W
Radiometric eff.: 49.8%
Radiant flux    : 0.38 W
Photon flux     : 1.99 umol/s (2.59 per Watt)
Blue            : 0% power, 0% flux
Red             : 67% power, 68% flux


XP-E2 Red
Power in        : 0.77 W (2.20V x 0.35A)
Luminous flux   : 73.9 lumen
Efficacy        : 96 lumen/W
LER             : 197 lumen/W
Radiometric eff.: 48.7%
Radiant flux    : 0.37 W
Photon flux     : 1.97 umol/s (2.56 per Watt)
Blue            : 0% power, 0% flux
Red             : 84% power, 84% flux
 
SupraSPL

SupraSPL

Well-Known Member
To add insult to injury the Amber suffers very bad temp droop even at 50C it loses 35% of its output and the green suffers from very high thermal resistance 15C/watt.

I have been considering the red/orange Q3 bin at cutter. Those wavelengths might be slightly less efficient for photosynthesis but has higher efficiency to balance that out and would spread the spectrum out a bit more. Same goes for the 470nm blue. It is less efficient than the Luxeon ES M4R deep blue (63.6% 350mA 50c) but since it would spread the spectrum maybe it would be beneficial. I would run them at 700mA so the XPE2 470nm would be 50% versus the Luxeon ES 445nm 55%.

Since Cree gives us radiometric data on the XPE2 royal blue we can skip the LER step. When I run those numbers for 50C I get:
350mA 1.06W 50%
700mA 2.24W 44.5%

This leaves the XPE2 royal blue far behind the competition, XTE royal blue (50% 700mA 50C) and the Luxeon ES (55% 700mA 50C). The XTE and Luxeon also have lower thermal resistance so there is a better chance of actually getting a Tj of 50C at 700mA.
 
PetFlora

PetFlora

Well-Known Member
Thought you guys would be interested in a free SSL seminar http://www.ledsmagazine.com/webcasts/2013/11/ac-leds-perception-vs-reality.html?cmpid=EnlLEDsJanuary82014

A free informative webinar presented by Dave Neal, director of applications engineering for Seoul Semiconductor, focused on AC LED technology. While AC LEDs have been gaining a quiet following in major lighting manufacturers, many lighting designers are still clinging to negative beliefs and outdated misconceptions from the early days of LEDs. Seoul Semiconductor squashes some of the existing myths of AC powered LEDs and demonstrates the strong performance of today's advanced AC LED systems.
 
SupraSPL

SupraSPL

Well-Known Member
So brand new HPS bulbs start off at 36% efficient and output drops fast. After 6 months of 12/12 it is down to 31.5%. After 12 months it would be down to 29.5% efficient. Metal Halides have it even worse. That is very encouraging for the economics of LED.
 
S

skunk1908

Active Member
i a 80x80 cm grow tent how many panels is optimum to use for best coverage
i want to have 4 medium size plants autos in it
 
stardustsailor

stardustsailor

Well-Known Member
Flashback ...Back in September 2012 .
It was some months after the market release of the ASL 24 panels,by Astirgrows .
Back then,some NW ,WW and monos of 645nm (all custom made for Astirgrows,by a Shenzhen-located manufacturer ),
were used for the making of these panels.
Recently ,A friend showed me a video from a grow done back in 2013 ,using 15x ASL 24 GP.

 
Bosgrower

Bosgrower

Well-Known Member
skunk1908 said:
i a 80x80 cm grow tent how many panels is optimum to use for best coverage
i want to have 4 medium size plants autos in it
Click to expand...
I just posted my plan for a 12 COB fixture for a 4x4 (80x80) that you might find helpful.
http://rollitup.org/t/matching-drivers-and-cobs.883866/page-70#post-13278437

After a lot of souI searching (i.e. staring at my bank balance) I decided to bite the bullet and use cbx3590-CDs, but you could do something similar with cbx3070-BBs.
Let me know what you think.
 
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