K temperature Question

[Spewn]

Alright, so I've come across a test which seems to show a fairly clear result in terms of more blue vs more red. Link available upon request.

 

[Que]

Please post.

Q

 

[Mindcrime121]

:iagree:

 

[jmhart]

I found the link

 

[Squawkbert]

http://www.aquabotanic.com/lightcompare.htm

Excellent article!

 

[phanmc]

The authors conclusion for that test was:

"The most important conclusion in my opinion is that the efficiency of converting electrical energy into PAR light energy is not that different for the several bulbs and technologies included in the sample. The majority of bulbs in the sample deliver approximately (within a 20% range) the same amount of uE/s/Watt in the 400-700 nm range, about 1 uE/s/Watt. High intensity discharge lamps and high-end fluorescents tend to be more efficient, but not by a large factor. "

You pointed out an anomaly, not the general trend. The author seems to think that the differences even across the various technologies are minimal. The differences across bulbs rated the exact same is yet smaller.

The author's conclusion goes pretty well with what I've said, which is in general most lightsource will grow plants about as well regardless of kelvin, lumens, CRI, etc.

So the point of contention left is whether more light in a specific range affect plant growth in a certain way.

As for not noticing yourself; What can I say except that a whole lot of people(see my links) do indeed notice, and that these people tend to have a vested interest in knowing the difference(growing crops under artificial light).

It may well affect terrestrial growth and improve flowering, etc. In fact, I don't doubt that but we aren't trying to encourage flowering in our aquariums nor are we growing crops or fruits. As you pointed out we usually work with much lower light values compared to terrestrial growers. At our level it makes no noticeable growth difference if you use a warm white light or actinic.