I prefer the radions for the huge spectral range and power they deliver. IMHO, it's hard to justify the need to replace bulbs again and again when you can go with LED and just forget about them for 5-8 years or more. For reference, I have a pair of AI Sol blues that are now 8 years old and going strong (on my FT), a pair of Kessil A360W's on my QT that are about 6, and a pair of radion XR30 G4 pro's on my 120DT. Before that, I was T12VHO for 25+ years.