What was he implying exactly by incorrectly stating the electrical cost is reduced by 50%?
I understand that and agree 100%, however I will be using these at 1/3 of the rated current, less current/watts=smaller wire size required or in this case copper weight.
I don't really see why copper weight would really matter with cooling, the copper is only on the board inbetween the individual diodes and connecting the rows of diodes, it carries the voltage and current, what would that have to do with needing heatsinks or not? I understand if there isn't enough copper there it's just like having an undersized wire that overheats but as I said before I'm running at 1/3 the rated current. Plus these will be mounted in a vertical orientation which will cool better than horizontal, this doesn't mean I won't be measuring the running temperature however.