[tang daddy]

The most common combo is led and t5 mix.

If you have a chiller and can afford bulb changes every 8-10 months then t5 are a great choice, but they put out a fair amount of heat so unless the fixture is well ventilated it will transfer some heat into the tank. LEDs are great for growing coral but sometimes can be expensive to start up, the up sides is virtually no heat and no bulb change. Downsides is leds don't have tons of spread and light is directional so lots of shading which is why people supplement with t5.

I run all 3 and couldn't be happier!