Dim light and Live Plants - Page 2
Tropical Fish

Tropical Fish Keeping - Aquarium fish care and resources » Freshwater Fish and Aquariums » Beginner Freshwater Aquarium » Beginner Planted Aquarium » Dim light and Live Plants

Dim light and Live Plants

This is a discussion on Dim light and Live Plants within the Beginner Planted Aquarium forums, part of the Beginner Freshwater Aquarium category; --> Plus, if I recall correctly a "peak" in yellow or green (both colors are useless to plants) will skew the lumans higher because of ...

Reply
LinkBack Thread Tools vBmenu Seperating Image Search this Thread vBmenu Seperating Image
Dim light and Live Plants
Old 11-11-2012, 03:38 PM   #11
 
redchigh's Avatar
 
Plus, if I recall correctly a "peak" in yellow or green (both colors are useless to plants) will skew the lumans higher because of the way human eyes percieve light.
redchigh is offline   Reply With Quote
Old 11-11-2012, 07:20 PM   #12
 
Geomancer's Avatar
 
Quote:
Originally Posted by redchigh View Post
Plus, if I recall correctly a "peak" in yellow or green (both colors are useless to plants) will skew the lumans higher because of the way human eyes percieve light.
Lumens are a measure of the total amount of visible light passing through a particular area, so doesn't mater where the peaks are as long as it is visible light.

PAR is a rating of how much useful light energy there is for plants, but a meter for this is very expensive and next to no light manufacturer specifies this. Which is really too bad, they should at least for aquarium lights. Give a number based on set tank depth, or put a graph on like they do for the color temperature.
Geomancer is offline   Reply With Quote
Old 11-12-2012, 07:00 PM   #13
 
Quantum's Avatar
 
Lux measures light per unit area, lumen is a measure of light emitted. But what redchigh is referring to is that these photometric measures are weighted to account for human vision, which is not equally sensitive to different wavelengths. So different light sources emitting the same amount of light, but at different wavelengths can have different lumen ratings.

I agree that PAR would be better, but when given as number of photons/area/time as this is what is most relevant to the photosynthetic process, though it says little about wavelength other than it is between 400 and 700 nm. Ultimately, though it's is just a number, and not of much use in my opinion.
Quantum is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Marineland LED light system and low light plants mcb5522 Beginner Planted Aquarium 7 03-07-2011 03:40 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -5. The time now is 01:06 AM.