LED Engin High Efficacy 365nm UV LED Emitter ,that's good quality LED chips on the market . Usually those UV , IR are all Cheap Chinese LED chips . Cheap quality ones , failed easily .Not true about the 380s. You can get LEDEngin 365nm on Mouser. I'm pretty sure ThorLabs makes them also. 365nm for curing are getting down in price. Lower than 365nm ones are out there too. There are UVC diodes for disinfection too.
http://www.mouser.com/new/ledengin/ledengin365nmuvled/
http://www.mouser.com/Search/Refine.aspx?Keyword=154120973
It's according to the led chips and led drivers those manufacturers use . The cooling systems they use . Heat cooling system is key for led light Tech . LED chips and LED drivers are also important for led lights . Usually in order to make more profit from the led grow lights , they use cheap led chips and led drivers . Cheap led chips and bad quality led drivers make the led lights failed in very short time . Because it's hard for us to know whether the led drivers and led chips are good quality or not . Even cheap ones can last several monthes or even longer .i thought led lights didn't burn out???