RapidLED fixture

[dseg]

I am selling what I think is a RapidLED fixture of white lights. I bought this as part of a system purchase and they were using this fixture to light their sump.
The LEDs are extremely bright. I would like $100 shipped.
12x8.5"

 

[LukeG]

What are the dimensions of the heat sink?

 

[dseg]

12x8.5"