I don't have a clue. I bought the Kind because of the Reviews and then later I noticed it was Kind doing the reviews. I never trust anyone claiming to be the best. Shame it's so hard to find independent reviews. Kind light is obviously good but how good? That is the question. The Mars have a lot of positive journals and seem like good value for the buck. Grow northern really interests me because of low power consumption. Is there an american version in the pipeline? Keep reading MC.. Keep reading. Now you've got me interested in checking out Cidly