I built a rapidled t5 retrofit kit. Very happy with it. Replaced 2 18" t5s with 9 leds on my nova extreme pro 20". They provide good support and cut the heatsink to size for me.
There's nothing unique about the the rapidled kits so you're basically asking if leds can support sps. there is a debate going about this. I don't know as I have an led t5 mix.