How many Watts of LED? - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 10-09-2012, 12:56 AM Thread Starter
Newbie
 
RossC's Avatar
 
Join Date: Oct 2012
Location: Walsall, UK
Posts: 3
Cool How many Watts of LED?

Hey everyone, I'm planning on converting my 95 litre, heavily planted, high tech tank currently using a 20W T8 to a custom DIY LED setup. Realistically I don't want to exceed 45W, I've been looking at using Cree XP-G 3W's as I've heard good things about them. Roughly speaking how many would you recommend for a medium light output?


Tank Specs:
95 litre / 25 US Gal
L80cm x H45cm x D30cm
Pressurized CO2 Injected
TNC Lite Liquid Ferts Weekly
40-50% WC Weekly
1000LPH Cannister Filter

Thanks

RossC is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 10-09-2012, 02:35 AM
Planted Tank Guru
 
Hoppy's Avatar
 
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,955
This might help answer your question: One Way to Design a Planted Tank LED Light

Hoppy
Hoppy is offline  
post #3 of 7 (permalink) Old 10-09-2012, 11:25 AM Thread Starter
Newbie
 
RossC's Avatar
 
Join Date: Oct 2012
Location: Walsall, UK
Posts: 3
I'm struggling to work out the equation, if anyone could help me please?
LED model Cree XP-G R5
LED current 3
lumen output per LED 118.8 (L)
Height of light from substrate 24 inches (H)
Optic cone angle 60 (probably 60 or 40 degrees) ()


Thank you

RossC is offline  
post #4 of 7 (permalink) Old 10-09-2012, 11:56 AM Thread Starter
Newbie
 
RossC's Avatar
 
Join Date: Oct 2012
Location: Walsall, UK
Posts: 3
I found the working PAR calculator and if i've done it correctly in order to get PAR 50 at 24inches I need to space them 1.38inches apart in a single row. Does this sound about right?
So if my bar is 80cm long (32inches) I need about 24 LED's

RossC is offline  
post #5 of 7 (permalink) Old 10-09-2012, 04:23 PM
Planted Tank Guru
 
Hoppy's Avatar
 
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,955
I would use one row of LEDs, given that the tank's front to back dimension is only about 12 inches. The lumen output per LED is about 400 lumens, not 120, and this is at 1.5 amps of current. That gives a spacing of 2.5 inches, or about 12-13 LEDs (60 degree optics)

Hoppy
Hoppy is offline  
post #6 of 7 (permalink) Old 10-10-2012, 10:38 AM
Newbie
 
Join Date: Oct 2012
Location: fgfhgh
Posts: 3
I'm struggling to work out the equation, if anyone could help me please?

Creating so touching plots and decent character developement, Mickey's Twice Upon A Christmas DVD will be the next huge thing on your TV with Rules of Engagement Seasons 1-4 DVD!
MegganKelley is offline  
post #7 of 7 (permalink) Old 10-10-2012, 04:42 PM
Planted Tank Guru
 
Hoppy's Avatar
 
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,955
Quote:
Originally Posted by MegganKelley View Post
I'm struggling to work out the equation, if anyone could help me please?
There are 3 versions of a calculator - spreadsheet - that you can use without even knowing what the equation is. I always use those calculators now.

Hoppy
Hoppy is offline  
Reply

Tags
cree, diy, led, planted

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome