It’s actually not exuses. It discussion. It is in fact, theses discussions that make change. You may have noticed , they are now making t5 led hybreds. That came from right here with hobbiests. You may have noticed they are now making leds with diffusions. It’s impossible to rember how many diffusion threads I’ve been in over the last three years. This is how progress is made in fact. Novelist is making excuses. There are none. Led grow coral when it’s done correctly. We can suppose and keep referring to uv and far red as a superstitious cling to old tech when the biology still doesn’t support it. None that I have seen, I should say. And past red is heat. And if you look at a red led I have with a $3 spectrometer , it’s not just 660. In fact led builder guys get all bent that the spectrum of the colors get to broad. (Lol right?) they call it “dirty”, and start saying binning and cree and have a bunch of other justifications. IMO , the reason a mars or no name B.B. work so well is becuse the thing is a dirty spectral mess with too much blue and maybe too much green. Depending on the day it was built of course. They run out of stuff. As much as I have a life long passion for arc lamps , after I went 14mh (600paris at the top of a 20 in) then the radium, I went to an SB black box (was sad I couldn’t do the heat here) same basic par, in two weeks my acros sprouted and went nuts. I don’t know why. But that’s why I’m here looking to find out.