Can someone please check these calcs?
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Lighting


Reply
 
Thread Tools Display Modes
Old 03-21-2013, 11:13 PM   #1
pizzytinzel
Algae Grower
 
pizzytinzel's Avatar
 
PTrader: (0/0%)
Join Date: Mar 2013
Location: Devon, England
Posts: 6
Default

Can someone please check these calcs?


I read Hoppy's guide to LEDs a few times today, and I've almost got my head around it! Seriously though, that's some good work

Anyway, this might be a bit backwards, but I'm trying to ascertain whether or not, theoretically, my BiOrb Intellegent LED light fitting is going to work for me, or whether I might need to go a DIY route with my BiOrb Life 16 (16" x 24" x 12"). The Intelligent Light boasts 3 "High Output" LEDs at 6500K. That's about as much information as I could find. They run off a 12V power transformer, if that helps...

It's going to be a low tech, low light (15 to 30 PAR) planted tank, with Java Moss and Jave Fern, that kind of thing.

Firstly, I'm looking at the spread of the light intensity portion to see how many rows of LED's I theoretically need. My calcs suggest that at an "H" of 21", 1 led (or a tightly packed group) is enough to light an 18" circle - more than enough to cover the base of this tank. The iLight has 3 LEDs, in the centre of the tank, so that's fine.

I'm now trying to solve for the "lumens per LED" to see if they will likely give the right intensity. Using the spreadsheet, H is 21", LED spacing is 2" and I've used 1.5 rows. Not sure if that is correct, but the LEDs are spaced in a triangle, 2 x 1" apart and 1 at the apex, 1.5" from the others. Solving for PAR = 25, we get 72 Lumens per LED.

So, theoretically, the BiOrb LEDs need between 43 and 85 Lumens each to work for me. Have I got that right? Or are my assumptions all wrong? I feel like the Intellegent Light should work, given that many of the LEDs I've looked at are rated around 100 Lumens at 350mA using 1W of power. Am I really wide of the mark here? I feel like I may have made some sense!
pizzytinzel is offline   Reply With Quote Quick reply to this message
Reply

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:

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
Display Modes

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

Forum Jump


All times are GMT. The time now is 07:08 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012