The Planted Tank Forum - View Single Post - DIY LED for 90cm/36 inch 48 gallon tank -FINISHED! Pics/PAR levels on page 2
View Single Post
Old 02-04-2011, 04:56 AM   #1
IWANNAGOFAST
I see LEDs
 
IWANNAGOFAST's Avatar
 
PTrader: (33/100%)
Join Date: Jan 2008
Location: San Francisco
Posts: 1,864
Default DIY LED for 90cm/36 inch 48 gallon tank -FINISHED! Pics/PAR levels on page 2

Ok, I've been reading all the LED threads while at work and it's time to poop or get off the pot.

I have to replace the 3 bulbs on my 3x39w t5ho fixture soon and with the bulbs costing me about 25 a piece, I figure I might as well go LED and get it over with.

My tank dimensions are 90cm x 45cm x45cm or 36x18x18 inches. Light will be mounted however high it'll have to be to give me 70-75 micromols PAR rating.

I've always tinkered with computers, but never built anything of this magnitude before.

What I've ordered:
30 7000k Steve's LEDs. Half the price of Crees. (I only plan to use 28, but 2 are just in case of mess ups)
http://shop.stevesleds.com/3-watt-Pu...chip-7000K.htm

2 Mean Well LPC-60-1050 drivers
http://www.rapidled.com/servlet/the-...onstant/Detail

Power cords, thermal adhesive and hanging kits.

Total spent so far: 181.28

Still need: heat sink.

I was about to buy a 30x7.2 inch heat sink from heatsink usa but shipping was ridiculous! I'm going to try to find a local computer store to get one. Otherwise I'll get some aluminum and attach fans to it.



I'm going off this post
http://www.plantedtank.net/forums/li...ml#post1281039
as far as par goes. He got about 110ish PAR at the substrate from his fixture with 48 LEDs, so I'm hoping with less LEDs I can get to my goal of about 75 umols

I realize this will still put me at pretty high light, but I will lift the fixture and hopefully this will 1. reduce the PAR, and 2. help the light spread out better.

Our local club has a PAR meter that I can use so I'll provide solid numbers once I finish.

Here is the proposed wire up. It's not to scale or anything, but it gives you a general idea. 2 "arrays" on the side, and a big "array" in the middle.



Any help and what not would be great!

Last edited by IWANNAGOFAST; 02-20-2011 at 11:33 PM..
IWANNAGOFAST is offline   Reply With Quote