Nice find Rocket. Has to be one of the best $80 lights I've seen. 79 cents/watt for white with 660nm reds.This is a similar priced light:
Not saying its great, i havent tried, but defo better.
High diode count means less watts per chip, smds are usually a bit more modern and efficient, the fact it dont need more heat sink also indicates more light per watt. If you can change try to do so.
Or aw16 mars light but i dont know the price points.

I love the large size, (15.75 x 11.81in / 400 x 300mm), great light spread and lots of cooling area.