I agree on several levels. You are correct that white led’s use a phosphor coating. Just because it has phosphor doesn’t mean it’s not a white light source. And pretty much all of the color temps produce some amount of light in all wavelengths from 400-700nm. Which does indeed make them full spectrum. I wouldn’t question a plants ability to absorb blue and red better than other colors either. Yet to argue that a white led can’t produce both seems silly. They produce plenty of blue and red wavelengths, in addition to the yellow and green. On top of that, they do it at higher intensity typically with a lower cost.
I have looked all over the Internet for other lighting that’s more efficient than led. Here’s what I found… a de gativa is like 1.9 ųmol/joule max. A Cree cxb 3590 even at 2.1 amps is still over 2 ųmol/joule. And the cxb is nowhere near as efficient as the Samsung top bins. Those two are just the easiest to compare due to the quantity of each in use for horticulture purposes.
The Samsung like every other “white led” does produce a lot of yellow and green. And yet they still yield more weed than blue/red alone, and absolutely crush hid yeilds. And cfl yeilds aren’t even worth throwing into that conversation.
It doesn’t matter if you look at lumens per watt, or ųmols per joule, it doesn’t even take the latest and greatest led to crush them all in efficacy. So I’m not even sure where “all over the Internet” you would find such data? You don’t have to agree with me. @Niala’s report says way more than green light helps you see plants. Perhaps look at some grow journals. Hid growers are still chasing a gram per watt. You can screw up an led grow and hit that.
Unless of course you have examples of grows using cfl, hid, or blue and red diodes alone yielding 1.5 grams per watt plus? If you can show me, I’ll believe it. Otherwise I have access to 5 different grows that have converted to led and I’ve yet to see anything of the sort. In my opinion, with the current technology, the best use of the colored diodes is to supplement white. Using them alone it becomes to expensive to match the par levels. And even then, they still don’t seem to yeild as much.