I adopted my beardie at the end of Jan of this yr. The Powersun MVB is the only bulb I've used. I have not had any problems with it & my beardie seems to be thriving.
On Jan 30th she was 6 1/2" and 7 grams, today she is 15 3/4", 354 grams.
I have one warning with this bulb, I would not use it in anything except a deep dome fixture, we initially had it in an 8 1/2 inch dome & not paying attention one night I melted the plastic edge of our aquarium as the bulb was below the bottom of the light fixture so the bulb actually rested on the metal screen top of my aquarium.