Be aware that with the Arcadia MVB bulbs (if you're in the US),
that you'll also need step-up transformers as they require 220 volts
to operate.
The Arcadia 12 long tube florescents (T8 models at least) will work
in US fixtures with US voltages, but the MVB's don't.
I'm using the Arcadia MVB's now, and I've used PowerSun's in the past,
and I must say that I like the Arcadia's better overall, even with the
voltage issues.
The PowerSun's I had, all three, burned out and stopped working after
about 5 months. That may be more due to my spikey power than the
bulb, but . . .