Hello,
In comparing these three leds the razor led is far superior to the other two. Granted, yes there will be about a million different opinions, on this topic. From a tech point of view and lab point of view, the razors are far better.
Reasons for this, if you go with the really old radions and they break, well good luck fixing them. More than likely Ecotech will suggest you upgrade and charge you another 699 for one. Plus the technology in the new razor is far superior to that of the really older radion.
The tmc luminary is less well known or covered, maybe hard to get some support for. For prime example, even searching for the luminar I couldn’t find any local places that even carried them, but did find some outside of the USA. I also wasn’t able to find many reviews on them either so (Yes I’m one for the underdog also) which isnt great or bad, but shows maybe hard to find support for. They do have more feature than the radions though. In order by far the razor, then the tmc, then radions. We all know getting parts or fixing these radions would be overly expensive if not even likely. Tmc probably not far behind but much newer, but with him buying used there goes warranty.
At least with the razor, some of the major online stores carry them so he has a better chance. I do know that I have seen local aquariums use them and have had great success with them. They would also have much better spread then the others (with radions being simple puck style), which is a disadvantage.
If your able to view said three lights I would look them over and see their condition. As well maybe see how they look over a tank and go with what the color appeals to you. That ultimately needs to be something high on your list. I’d love to hear which one you decide to go with.
In regards to t5, mh etc again so many options and opinions it’s like comparing ford to yugo, never ending debate. I will caution you that corals are (if you have a bunch) not found of light changes. I temporarily switched mine from led to t5 (because the guest tank used only t5), my corals over six months were pretty mad at me, (which most died I’ll add). I’d keep your old lights, still for when you switch and the corals start to go south, you can switch it back fairly quickly.
Wish you well on this fun adventure
Sincerely
Sarah