That's a heck of a lot of light coming out of a plastic light. Must feel a little funny holding a plastic light pumping out that many lumens. How does it feel in comparison to the SRK weight wise?
I really like that, thanks for sharing.
LOL, it vibrates!
That poor 12V fan is spinning like crazy running on 16V
It’s a flooder though for sure. Like you pointed out in another thread the reflector is shaped so that most of the lumens just spill out.
I wouldn't think the fan needs to spin very fast to effectively cool that heat sink. You planning on putting a resistor in series with the fan or something when you go to the next level of cells?
Looking forward to hearing how your XHP70 handles 4 health cells.
HAHAHA, that is some awesome sleeper man, excellent work!!!
GB anyone? 
Grtz
Nico
That’s pretty sweet! Thought about resistor modding the fan to get the voltage lower?
Yes I will do, AHEM, “the resistor mod”
I’m gonna have to open her up too as pommie pointed out. It’s gotta breathe, it gets hot in there!
Heck even a “Sleeper Car” might have a hood scoop, right?
I’ll do it discreetly. 0:)
dchomak thank you so much…
Excellent, Excellent, Excellent
Wow your explanation is one anyone can follow (if I can). I had to look at it for a while but now I get how you are using the FET (look at me throwing big words around) 
to be the actual switch. I guess with all the resistors it is not open and closed but more and less closed.
Sorry lazy brain, yes I did not take the time to check the voltages at 4s you are already over the 12v for the emitter. Better to go with 4s2p heck, you have the room.
You definitely got it, but I want to make a slight correction to your thought and 1 more analogy here.
In the picture of the water Gate valve, imagine instead of the gate being connected to a screw that is turned to open and close it, but rather just a simple shaft that can slide up and down. In the position that the diagram is in, imagine that when the gate is down it is because gravity, which is always present, pulling it down. To open the valve you have to “pull up” on the shaft, overcoming gravity. As long as you keep pulling up on the shaft, the gate is open. But as soon as you let go, it falls back down and shuts off. I like to think of that 68K resistor as though it were the gravity that keeps the valve shut off.
I did the resistor mod and slowed the fan done some.
I also did some calculations on what it would take to keep the inside of the light cool. At first I thought I could use these 2 small 25mm fans I had but based on their 2.3 CFM airflow, they are not enough to get the job done.
Those fans in a push-pull configuration in order to carry 60W of heat out of the light would have to exhaust air at 152 degrees Fahrenheit. That’s way too high. Turns out using 1- 50mm fan is enough.
Another strange thing about this light, IT GLOWS 
So much for plastic reflectors, the XHP-70 is so bright it just blasts thru the reflector!
great pictures
Damn, that's crazy with the light going through the reflector like that. Looks like a mini nuclear reactor or something.
Looks ready for some night time drag racing and dominate the streets at night! Cool Work amigo
You sound like an old gearhead.
Back in the late 60’s, I had a sleeper car. I had built a Chevy 327 with all the good stuff and before I put it in ’63 Nova that I had waiting for it, I dropped it in a ’62 4 Door Nova. It was a junker and was painted flat black with the stock 13” tires. The front shocks were toast and it was like having NO shocks. The first night I was out with it, I hadn’t even put the hood back on. I was up on the highway, doing about 60, when a couple of guys pulled up along side EDIT: (In a Corvette) and started playing around. I floored it, my front end shot up so high I couldn’t see the road at first, and pulled them bad. They followed me off the exit ramp into a fast food parking lot, and we all just laughed our heads off.