No falsehoods on my part anyone is welcome to come to my house and put their hand on MH fixture. If you had went to MACNA you could have put our hand on the Reefbrite 250 watt fixture they had been running during the show.
Yes there can be heat transfer if you mount the fixture right on the top of the water. Mine is 10" off the water.
"Metal halides aren't really "plug and grow" either - many hobbyists have bleached corals under MH's, especially early on in their usage. Many current and new hobbyists have used LED's "safely" and "successfully" by doing some simple research."
Not as many as those under LED's An it really isn't as hard to set up a MH fixture.
"Shading does actually occur with MH too, and is highly dependent on the reflector size, plus lots of MH users also supplement w/ T5. LED shading (and especially spread) can be mitigated in smaller form-factor fixtures by simply raising the fixture higher above the aquarium."
Not near to the rate as LED fixtures as one raises the fixture the lenses that the new LED's are using change the angle. When a manufacturer says to mount a light at 9 inches and makes and sells a mount to put the light on a tank. An then people No you have to mount the light 17 to 20 inches to get the "new" light to work and turn the light up to 100% What is the new hobbyist to do? There is confusion as to what and how to run a LED fixture.
People add t5's MH to bring out colors just as LED users turn up the blue on their lights to bring out colors. This doesn't help in anyway to grow corals it just is for those would what the neon colors of the corals to shine.
"Fail to see your point, other than a rant against LED's. Many aquarists have used fixtures for multiple years without issue. There is often no need to upgrade, and to blame manufacturers for offering new features seems petty at best. The same can be said (and has been to be honest) for protein skimmer offerings."
Well you saw this past summer a ton of G$ radion sold Even Sanja got rid of his and add even more to his tank than he had before. It is not blaming the manufacturer's. It is pushing them to make a better lamp. a row of LED's and slapping them in a metal case does not take a lot of effort.
My concern is the new hobbyist that buy's one of the approved LED's and does his work and keeps his water quality up and does every thing you want him to do and still can not grow corals. He is then left to think that he is a failure. Because he used LED lights and everyone else is growing corals out of their tanks but I can not. So they leave the hobby the long this continues the less hobbyist there will be.
I teach new hobbyist and help at my local LFS to make hobbyist successful. I am not going to let a new hobbyist fail because he spent a bunch of money and it just is not working for him. In 99 percent of new hobbyist case that I work with we go thru all the elements of the tank water chemistry and lighting. I set up LED's with a PAR meter and we adjust it correctly.
I let the new hobbyist use LED's but if the call me 6 months later with problems and I we do a investigation on what is could be the cause.
An they change their tank to run T5 lights or MH the problem goes away.
An they start to have success.
"Plain BS - light is just one thing necessary for coral growth, and most LED fixtures provide plenty of light in the correct wavelengths. To claim otherwise is just plain silly."
So run a test put to of the same corals in two tanks at the same time running on the same sump. One using MH and one using LED. Which will grow a coral faster? Answer MH how do I know I did it. Have you done this test?
"You claim to have been in the hobby for some time, yet you consistently (over several threads) fail to appreciate the history of aquarium lighting, which has been pointed out by others. MH took quite a while to reach the current state, and is by no means the perfect "one size fits all" solution. "
I don't have to claim it I can show it.

My club has held 3 MACNA's I was on the board of directors for MASNA from the very beginning I have attended numerous MACNA and was involved in the effort to get better spectrums for MH bulbs. I know first hand the efforts we put into the hobby to get MH and T5 where they are today. I an others spent hours of our time researching and talking to lighting manufacturers. to find the specialized lights that we have today.
People buying LED's today are not pushing for better. They are saying these are great lights and so we have to add T5's to our tank to make the corals grow good so. So what if we have to cover every inch of our tank with LED's to go full LED. Hobbyist need to push the industry to do better. I want to see LED's work for everyone. They are not at that level yet and hobbyist need to complain to companies not say those that say they are not their yet are lying and making things up. That is not doing the hobby any good.
"Manufacturers offer hybrid lighting to meet a perceived "need" in the hobby, and not because they are nefariously trying to "prop up" substandard fixtures. Also, if you were truly aware of current LED lighting, you would realize that many companies does provide schedule/ intensity templates to hobbyists to aid is the use of their fixtures."
There should be no need for Schedules the research that companies do should inform them of where the levels should be and yes I know I have Radion's Kessils and black boxes in my box of used equipment. I do lighting and color testing in my line of work. I calibrate lighting for color grading of products. I have been in the field for 40 years now. So lighting is nothing new to me and one of the reasons I have been involved with the hobby so long.