dude you could not be sooooo far off the mark...
the mega ray can last up to 4 years with still a decent ammount of uva and uvb.....its the bulb most zoos if not all use now.....you wont ever go back to tubes......i ran arcadias and zoo meds
got my self a uv wavelength reader and the mega ray produces more uvb and uva by loads and lasts 10 times longer
just look in to them on the internet
But generaly speaking most multi bulbs are crap ive ran most of the decent ones..........and il NEVER use anything else than a good old mega ray
http://www.uvguide.co.uk/
and of course
http://www.megaray.co.uk/
ive got 90% of the people i know who breed reptiles using theese bulbs..
dont f**k around with the tubes,,,,,,,,,,,look in to MEGARAY LAMPS if you really want whats best for you reptiles
id get the 120 self ballast bulb
thank me later