One Way to Design a Planted Tank LED Light
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 03-13-2012, 08:19 PM #2 dbosman@msu.edu Planted Tank Guru   PTrader: (16/100%) Join Date: Jul 2008 Location: East Lansing, MI, USA Posts: 2,710 I propose this single post be a sticky. Unless there are specific additions that will clarify something specific let us not clutter this one up. Please.
 03-13-2012, 08:58 PM #3 KrazyFish Planted Tank Obsessed     PTrader: (0/0%) Join Date: Dec 2010 Location: Binbrook, Ontario, Canada Posts: 428 Great info! Thanks Hoppy!
 03-13-2012, 09:17 PM #4 BlueJack Planted Tank Enthusiast     PTrader: (0/0%) Join Date: Apr 2011 Location: Fl Posts: 736 Always enjoy reading your posts! __________________ Great minds discuss ideas, average minds discuss events, small minds discuss people
 03-20-2012, 05:10 PM #5 wastedtime Planted Tank Obsessed     PTrader: (23/100%) Join Date: Oct 2011 Location: Massachusetts Posts: 452 Great info Hoppy. Thanks , Nice and concise.
03-31-2012, 04:23 AM   #6
Hoppy
Planted Tank Guru

Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,433

The angle is the advertised cone angle of the optic, not half of it. I corrected this on the spreadsheet, and added a calculation for the LED current for Cree XM-L and Cree XP-G LEDs. But, I don't know how to attach an Excel spreadsheet to this post. Once I know how to do that we can include both the correction and the added calculation.

I used the Cree pdf for each LED model and derived an equation that works for most of the range of the Lumens vs current graphs here. The equations work for the 350 to 1500 mAmp range for both of them. For the XP-G the equation breaks down for lower currents, and for the XM-L it breaks down for higher currents, overestimating the lumens produced, in both cases. But, I wouldn't even consider using a higher current for either LED, just because of the cooling that would then be required for the heatsinks.

Thanks to fizzout I learned how to to this: Here is the updated calculator, for which fizzout gets 95% of the credit.

Edit: Added Cree XP-E-Q5 LEDs which are available at DealExtreme, and which are more suitable for lower height tanks.
Attachment 44862

Edit: Added Cree XR-E-P4 Bin WD (5700-6350K), which are less than \$3 each on DealExtreme. Attachment 44874
Attached Files
 PAR_Calculator 3.xls.zip (2.3 KB, 1664 views)
__________________
Hoppy

Last edited by Hoppy; 03-31-2012 at 10:07 PM..

 03-31-2012, 11:25 AM #7 fizzout Algae Grower   PTrader: (14/100%) Join Date: Jun 2011 Location: Southern California Posts: 137 Hoppy, Thanks for making the correction. Now the calculator can really be a useful tool for anyone designing a new LED lighting.
 04-01-2012, 02:10 AM #8 Doc7 Planted Tank Enthusiast   PTrader: (4/100%) Join Date: Apr 2011 Location: North Jersey Posts: 514 And with that the light design philosophy for the next 1X years has been written. Think I'm pretty well set that I want to do an LED next then. Will pick up some valuable soldering/electronics skills along the way. I know I read Hoppy in another post that the "number of rows" multiplication may not hold up once the spacing between rows grows to the 6" distance which would happen if I spaced out even 3 over the middle 12 of an 18" front-to-back, so I will have to use this thread, other graphs Hoppy's posted, and probably a little guesstimating to figure out how to build a 40B light. I will need to crunch some numbers in Excel if I get a chance this week but thinking I'll try to do it with three rows, but treating the PAR value as "two" rows because of the wide spacing between the outermost front and back. I am presuming, before having done the numbers, if I aim for 50-60 PAR with 600-700 mA this three row design would get me close enough that I could either go down intensity or up, if I'm wrong, and not hit the "min current" or "need cooling" thresholds. Use of LEDs will allow me to build a light to fit my desired canopy design, instead of building my canopy around desired lights (for T5HO I'd need to be concerned with heat as well as height, on a 40B I will want a "squatter" canopy) Sent from my BlackBerry 9650 using Tapatalk __________________ 40 Breeder Journal Eheim Pimp Club - Member 468 (2 x 2217, 1 x 2213) ---- New Jersey? Nearby State? Join the New Jersey Aquatic Gardeners Club!! Meetups, Swaps, Local Members to discuss your tank, issues, and accomplishments! NJAGC Member since 11/2011
 04-01-2012, 06:17 PM #9 they call me bruce Planted Tank Obsessed     PTrader: (11/100%) Join Date: Feb 2011 Location: new jersey Posts: 486 Excelent work I just checked my proposed design for my 72x24x24 and its works--I mean its very close to whats been projected before this spread sheet. Wonderfull job alls left to do is place the order and put it together then comes the par meter--I have full confidence---
 04-01-2012, 06:19 PM #10 they call me bruce Planted Tank Obsessed     PTrader: (11/100%) Join Date: Feb 2011 Location: new jersey Posts: 486 Hey doc when will NJAGC update the site --is this group really up and running- dont mean to high jack thread you can PM me
 04-03-2012, 06:38 PM #11 Doc7 Planted Tank Enthusiast   PTrader: (4/100%) Join Date: Apr 2011 Location: North Jersey Posts: 514 The attachments included in the "Edits" above aren't working for me. I may be doing something incorrectly. When I click them, ie. "on DealExtreme. Attachment 44874" I get: Invalid Attachment specified. If you followed a valid link, please notify the administrator __________________ 40 Breeder Journal Eheim Pimp Club - Member 468 (2 x 2217, 1 x 2213) ---- New Jersey? Nearby State? Join the New Jersey Aquatic Gardeners Club!! Meetups, Swaps, Local Members to discuss your tank, issues, and accomplishments! NJAGC Member since 11/2011
 04-03-2012, 08:59 PM #12 Hoppy Planted Tank Guru     PTrader: (79/100%) Join Date: Dec 2005 Location: Sacramento, CA Posts: 19,433 The last attachment doesn't work for me either. So, let's try again: PAR_Calculator 5.zip Now, it works. Attachments are not nearly as easy as photos are. __________________ Hoppy
 03-17-2013, 09:54 PM #15 skanderson Planted Member   PTrader: (0/0%) Join Date: Jul 2010 Location: baraboo, wi Posts: 160 i think it is because i dont have microsoft office installed does that sound right?

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