Mars, Morsen,
Viparspectra and most of these type lights DO work to grow cannabis. However, when you read their specifications they are total lies. A 200 watt (drawn from the wall a true 200W) CANNOT provide 600 -1200 watts of light power. These specs and others are falsification. It just pisses me off that this kind of deception is just plain dishonest.
So, if you like your Mars or other light like it that is cool, just know that you are not getting what you are told. Just look at the specs and if it says 200w (true power drawn form the socket at the wall) it is really about the equivalent of 235W-270W of HID light. Typical LED efficiencies are about 30-35% better than HID so if they made a light that drew 200w from the wall and created 1200 watts of light (compared to HID) then that would be a total breakthrough of technology and people would ALL be using a cheap high output light and the supply would be exhausted in a couple days.
I am not trying to be critical of any given light source you may choose, just saying: Know what you are getting for the hard earned money you part with.
Dee