This thread is about the best light for the best result on a fixed budget.
You can keep dismissing BRS if you like. First you claimed they're only out to sell, even though they sell all technologies. Now you claim the measuring stick is your tank, like its a unique beast. A glass box is a glass box and the light will fall where it falls, it wont matter a hoot if its in your home or mine.
https://www.youtube.com/watch?v=ZjiH5Pbas-o&t=2s
The 4 bulb ATI Sunpower averaged 172 at 12" and 158 at 18".
The 8 bulb ATI Sunpower averaged 334 at 12" and 310 at 18".
Note there is hardly any change in PAR regardless of depth or height the fixture is hung at. An even blanket of light with excellent penetration.
Recommendation: 6 bulb ATI Sunpower.
Lets compare Radions and ATI T5 spread at a depth of 12".
Radion XR30 G4 Pro - $799
ATI 48" 8 bulb - $541
Covering a 8ft tank you need two ATI Sunpower at $1081 and four Radions at $3196, assuming you are willing to have every second foot of your tank at half the PAR (as per PAR measurement at 12" in BRS testing). Break even after 6.6 years of bulb changes.
Or, you could go the Hydra 52 HD rout at $600 each. Need four of those over an 8ft, that's $2400. Break even after 4.1 years of bulb changes.