There are just too many different phenomenae described of what will happen to different colors of light once they hit a leaf, blue/red gets absorbed rather quickly, and if one goes overboard with it will quickly lead to photoinhibition or heat damage while the rest of the plant is still light hungry in a shade.
Antenna systems can store much light energy but what happens when a 660nm photon hits a chlorophyl that already is in an excitated state? that 660nm photon is going to be converted fully to heat, it's lost.
Same situation, just take an orange 630nm photon: can either reach a higher excitated stationary state (a chl-molecule can have several excitation states... "tripletts") or it can initiate chlorophyl-fluorescence, then the previous 630nm photons gets absorbed & swiftly send out as 662nm photon to be available somewhere else.
That is, orange can reach deeper into the leaf/micro-tubuli/canopy as can green, UVA, FR, although each of these colours can use additional mechanism to do so. While FR can't use 662nm-fluorescence, not even a 660nm photon has the surplus energy required to initiate that.
Green bounces off alot to be assimilated at the 10th incident grossly estimated
FR just shines through
Scientifically speaking green has a high level of deflection, FR high transmittance, if you compare absorption charts you'll see how different these lightcolors are in their reaction with a leaf. Yet, some of these colors still reach much deeper down than red & blue.
UV can initiate even more fluorescence, you all know that black-light effect.
Very good link Cobshop that study explains alot. The problem of indoor light is some of the current LED spectra are too swiftly absorbed and that creates too much heat stress (= photon loss) on the leaves having direct light contact.
Outdoor we have 1700umol but
- much FR/IR
- heavy green & orange
(together forming green-darkred shadelight)
- diffuse blue-shifted skylight 30% of total irradiance
- not so high red peaks than ur LEDs have
- clouds giving leaves time to remedy some consequences of photo-inhibition of direct leaves
- wind
- moving sun
- almost no abrupt changes
- physics on our side
So many differences to what a plant is used to... some can be easily remedied by plant training, increase access to direct light.
Some are more & more discovered by science & followed slowly by the industry, e.g. lenses that create diffuse light.
It all comes at a cost - hardware plus higher maint/electricity. If that pays off is surely situational, but the science of it being beneficial for plants is already there, and still increasingly mounting up.
. Btw they still build clear low iron glass houses today..
