last set i got, both bulbs blew the same inner wire within days of each other after only 5-6mos use ... i have run another set for a year on my frag tank with great results....and before that i ran them on my display before decided to bump up the wattage. never had anything bad to say about them until the last site prematurely burnt out.
dont know how true it is, but have heard that they are working out a new manufacturer for these bulbs. that could change everything about them. may not be same color, ppfd, etc. I guess time will tell.
dont mean to spread gossip, but thats a consideration.