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Re: [APD] Re: Lighting

Odd thought:

when attempting to determine what bulbs are best for growing plants why not forget about all the spectral output/lumens-ratings/watts efficiency calculations, and instead set up a growth efficiency test.

chose a set of standard test plants, a standard growing setup(balast, tank, substrate, fertilization reflector etc. something that anyone interested in testing bulbs available them can acquire/build) and a procedure for measuring amount of plant growth. that way we can say plant species 'X' gained y% more mass due to new growth under bulb A than it did under bulb B.


Daniel Larsson wrote:

sh wrote:

It was just becasue of the problem of diff test conditions
that the feds set up a standardized method for the stated
fuel economy ratings.

Nevertheless I really think the lumens and spectral distributions are easier to quantify than just looking at Karen Randalls aquariums?

I also strongly believe that the lumens-ratings are not made
up, and even if they are measured differently between different manufacturers I would guess they're off by
a just some percent - about the same error as your
Karen-measurements would be? ;)

These numbers are not for noobs to be anal about, but
it's interesting to make a calculation on a bulb someone
says is good for growth and see if that is somewhat
, off by some percent, true. Or if the persons is lying
you right in the face.

It is also interesting because if you really get the
calculations behind the scenes you will have deeper
understanding whats going on both in the bulbs and in the plants. You will understand why the lumens-
measurement can't be used, alone, to estimate if the bulb is good or not for plant growth. You will know
why the lumens-measurement together with the wattage-
rating can be used in conjunction with the spectral
distribution to make a rather good estimate how good
the bulb light is for growing plants. With this knowledge
I can kick back, forget about the lights and just see to
that the plants isn't shading each other and start to fiddle
out my dosing regime and put all the efforts where it
should have been from start: On CO2.

Then I, as a noob, will have pretty good growth, off
by some percent.

// Daniel.

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