Zahn Electronics manufactures LED Lights

This is it. After 2 years it is on the internet.

Specifications:

48vdc  Range 0 to 60vdc. There is light at 36vdc.

If you look at the board with 44vdc to it, it will blind you.

The PC board is aluminum for heat sinking.

There are square pads on the left and the right for connecting the 48vdc.

The maximum light is at 44vdc, since that is when the current limit starts.

SEE:  LED light data

After that, above 44vdc and less than 60vdc, there is a current limit.

The current limit is DC, so no switching takes place and UL,CSA, etc rating is not necessary.

Price: a whopping $525 in quantity of one.

196X4=784 LEDs, .825aX4=3.3adc DC for 4 units. This is enough to light a 10' X 14' office.  48*3.3=158.4 watts

You will need a heat sink.

PC Board dimensions: 2.5" X 4.0". Height less than 1/8"

Holes are .140". They are on a square of 3.7" X 2.2"