There are shills that get free units to rep for LED companies. Some of them did not switch until they got free units and most of them will tell you that they would not be using them if they did not get free stuff - go to some trade shows and have a conversation. I got offered free units to say nice things about a certain company and their brands. If you see a large shop with 30-50+ units, chances are that they did not pay for many, if all, of them - anybody think that a reefing store has $50K laying around to not save any electricity costs (most of them do not)? Some also get better than MAP markup if they shill.
Not all companies do this, so do not assume. Some use what they want to use.