I dont think environmentally friendly has ever been a selling point for led.
I've certainly never heard any experienced grower suggest thst to me.
Your comparing led to hps like all led is the same. Blurple, cob and quantum boards are worlds apart.
Hlg, cree cobs and other high quality companies lights definately live up to their rated power, and efficiency as you can see from the grow journals and youtube videos.
-600 to 1000 watt hps give immense heat and suck back the power adding to your powerbill
-you need air cooled hoods to keep heat down or a very good exhaust system which can be costly
-you gotta change the bulb every grow or two to keep the lights output above 80% and good bulbs can be costly and if your an mh fan boy theres some more cost switching bulbs from veg to flower.
-quantum boards can give more output at 480 watts vs a 600 watt hps
-the coverage is more direct and even
-the spectrum can mimic the sun better than most hps bulbs.
To say led dont hold a candle to hps is straight up ridiculous.
They not only hold a candle, they are better in lots of ways.
If you factor in all costs.
I'm growing with both led and hps. I'm not on either side of the fence.
I'm on the side that grows quality dope
I dont care if I get there with hps or led.