Custom quad XHP70.2, 200W. Driving lights.

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Last seen: 3 days 20 hours ago
Joined: 01/29/2021 - 13:50
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Custom quad XHP70.2, 200W. Driving lights.

First post in this forum…

I have been playing with XHP35, 50 and 70 for long distance driving lights and made some prototypes. I have settled with Ledil Crystal and Flare Maxi lenses and XHP series LEDs, but I am open to suggestions that can improve the designs.
The main issue is how to control light spill, while keeping a diffused spot (sharp spot is not good for driving).

Ultimate goal: illuminate the road 500m ahead and 50 meters to the sides for driving safely at highway speed in remote roads (bears, elk, deer and all sorts of smaller animals going around).

Build 1: Wide angle and spot combination

  • LED XHP50.2, dedomed
  • 4A driver
  • Waterproof fans
  • Ledil Crystal RS for spots
  • Ledil Flare Maxi for wide angle. Assembled 35 degrees pointing outwards.
  • Controlled by the car’s high beam relay

This gives a great combination to illuminate far ahead and sides. You can see yards to each side of the road, which is great for finding deer before they are in front of your car.

Disadvantage: too much light illuminating the road close to the car, which “blinds” the driver. Possible solution is using XHP35 to have less spill.

Build 2: The super bright flashlight

  • LED 4 x XHP70.2, dedomed
  • 8A driver. Custom PCB design
  • ~215W going to the LEDs
  • Waterproof fan
  • Lens: 4 x Ledil Crystal RS
  • Battery: 18 cells of 3400mA 18650. 22.2v, 10.2A
  • Controller: ESP32
  • Wifi or pushbuttons
  • Modes: 0.1%, 1% 5%, 50% and 100% (of 8A going to each LED)

This flashlight can be controlled with pushbuttons or via WIFI. The idea is to mount it temporarily on the roof and link it to a cellphone or to the car’s high beam switch.

Test at full power. The trees are ~350 meters away.

Build 3:

  • LED XHP50.2, dedomed
  • 4.5A driver. Custom PCB design
  • Lens: Ledil Crystal RS
  • Controller: ESP8266
  • Wifi operation only

The idea of this is to have a network of light modules connected to 12V and controlled by a cellphone or by the high beam relay.

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Joined: 03/09/2016 - 15:24
Posts: 2162
Location: Ohio

Cool projects. I think you are on the right track with using TIRs to get a diffuse spot with less spill. But in your first build, with the lights so close to the ground it’s hard to avoid lighting up the ground too much. Maybe recess the TIR in a tube to physically block the spill light? That is maybe not a very elegant solution since it “throws away” light, but depending on the TIR the spill might be a pretty small fraction of the total output.

raccoon city
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It's good to have you here, pgodoy!


Last seen: 3 days 20 hours ago
Joined: 01/29/2021 - 13:50
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I do not mind “throwing away light” because I have a lot of light Big Smile I did not try with a tube, but I did try with a flat plate to block the light going to the ground. It works well, but it needs to be fairly big.

Mounting higher: totally agree. Ideally at hood level. The picture is for my daily driver, so I did want to mount the light at a discrete location.

Roof mount is out of the question for high speed. Great for cutting the light going to the ground, but small bugs give you a heart attack every few minutes because they are illuminated way too close to your eyes.

Lightbringer's picture
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Joined: 08/30/2016 - 14:12
Posts: 14479
Location: nyc

That’s one of those things where you’re just going to have to experiment with. 26mm TIRs would probably be better’n 20mm, but you have a variety of emitters, beam-angles, and mixing circular and elliptical, to get the beam-spread you want.

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