Security wall lighting fixture

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So right now I have a 70W HPS fixture up now I assume when the bulb is new it's around 6800 lm? So I have this vr2 lithonia fixture that I got free and in stock form it comes only with a 7W CFL with the ballast..

What I was proposing to do was to take that out and put LED's on a metal plate, but that's where I got stuck.. The fixture is 8 1/2" L 5 1/2" W I'm not sure I can totally get close to what the HPS fixture would be..

I wonder what's the best way to go about this if possible?

 

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Maybe 1 or 2 of these? I just don't know how hot they get

Also a few other things is how thick should my heatsink be and I don't need a lens in front of the LED's since the cover already has a design that should do well with the LED's?

http://www.digikey.com/product-detail/en/BXRA-50C5300-H-00/976-1077-ND/2797751

 

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Or I was thinking this

I wonder if it's better for me to use some smaller LED's like these like 6 of them

http://www.digikey.com/product-sear...=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25

Drive them at 350mA It should run cooler then a single larger LED right?

A little question Looking at the datasheet and no way can the LED assembly be 20 mm wide

Little mockup

 

[Ken_McE]

You can physically fit a number of LEDs in there, but I am concerned about how the fixture will shed heat, particularly if it is mounted flat against a wall. That cover isn't really designed to radiate heat.

If you are all hot and ready to build an LED light, why not just start from scratch? This fixture isn't particularly LED compatible. You could just put in the running gear for a metal halide HID and get better light with no heat issues. The efficiency would be comparable to LED without all the fuss.