Forgot, a few years back, Vipar was busted for using a bogus ROHS label..Why; because they spelled it wrong, and it was uncovered when the light caught FIRE! (a post on Grass City last yr).
This was my only concern buying the viparspectra but they seem to be really well made. i ran a small cupboard grow with 2 mars 240 and a vipar 450, started flowering with just 1 240 for 2 weeks and added a second for a week and the rest of the time ran 3 lights and ended up with 5oz of the best smoke ive had in a long time! Running 2 vipar 450s in a 80x80x160 tent in a 1 plant scrog to see how these do by themselves.
also the viparspectra have much more easy on the eyes spectrum closer to white where the mars are an eye hurting pink that i needed to buy glasses for haha