LED Foglight Project Options

[Spoke]

The design of an early foglight LED board has begun. mepstein sent me a couple of foglight fixtures to use to design the board. 2 main issues are fitment and heat dissipation. If things work out ok the design should be able to be re-laid out for the later square foglight.

The board will have 8 Cree XP-G3 high power surface mount LEDs with 350ma current each. These will burn about 1W of power with a total power dissipation expected to be less than 10W. Hopefully these will be almost as bright as a headlight.

Each LED will have its own focusing lens. The lenses are Carclo 10192 elliptical 20mm lenses. The light pattern for the 10192 lens is shown below.



This is the spectral dispersion for the lens.

[Luke M]

Would the fog light lens make a difference ?
I do not know so I figured I throw it out there.

Your 71 should have the early TN1-TN2 lens.
The LED fog lens is a later TN4.

[Spoke]

Would the fog light lens make a difference ?
I do not know so I figured I throw it out there.

Your 71 should have the early TN1-TN2 lens.
The LED fog lens is a later TN4.

Yes the '71 has the early lens and the LEDs have the later lens. The lens has got to have an effect on the light pattern. The TN4 with the LEDs actually makes brighter vertical bars. It would be best to have no lensing with the LEDs but the goal is to retro-fit these LEDs in existing fixtures.

I need to put the LEDs in an early TN1/2 lens. Anyone have a TN1/2 fixture they would like to volunteer for a while? Where's @mepstein ?

[mepstein]

Would the fog light lens make a difference ?
I do not know so I figured I throw it out there.

Your 71 should have the early TN1-TN2 lens.
The LED fog lens is a later TN4.

Yes the '71 has the early lens and the LEDs have the later lens. The lens has got to have an effect on the light pattern. The TN4 with the LEDs actually makes brighter vertical bars. It would be best to have no lensing with the LEDs but the goal is to retro-fit these LEDs in existing fixtures.

I need to put the LEDs in an early TN1/2 lens. Anyone have a TN1/2 fixture they would like to volunteer for a while? Where's @mepstein ?

I can send you one tomorrow.
@Spoke

[Spoke]

Would the fog light lens make a difference ?
I do not know so I figured I throw it out there.

Your 71 should have the early TN1-TN2 lens.
The LED fog lens is a later TN4.

Yes the '71 has the early lens and the LEDs have the later lens. The lens has got to have an effect on the light pattern. The TN4 with the LEDs actually makes brighter vertical bars. It would be best to have no lensing with the LEDs but the goal is to retro-fit these LEDs in existing fixtures.

I need to put the LEDs in an early TN1/2 lens. Anyone have a TN1/2 fixture they would like to volunteer for a while? Where's @mepstein ?

I can send you one tomorrow.
@Spoke

Thanks. You mentioned you had a nicer foglight fixture you wanted to use on your car. Are you sending that set too? I want to get the boards built up for your car and I might as well have the fixtures so I can install the boards on the lenses.

@mepstein

[mepstein]

Would the fog light lens make a difference ?
I do not know so I figured I throw it out there.

Your 71 should have the early TN1-TN2 lens.
The LED fog lens is a later TN4.

Yes the '71 has the early lens and the LEDs have the later lens. The lens has got to have an effect on the light pattern. The TN4 with the LEDs actually makes brighter vertical bars. It would be best to have no lensing with the LEDs but the goal is to retro-fit these LEDs in existing fixtures.

I need to put the LEDs in an early TN1/2 lens. Anyone have a TN1/2 fixture they would like to volunteer for a while? Where's @mepstein ?

I can send you one tomorrow.
@Spoke

Thanks. You mentioned you had a nicer foglight fixture you wanted to use on your car. Are you sending that set too? I want to get the boards built up for your car and I might as well have the fixtures so I can install the boards on the lenses.

@mepstein

I have two early sets I can send you. One question, to remove from the car, where are the wires connected.

[Spoke]

I have two early sets I can send you. One question, to remove from the car, where are the wires connected.

That's a good question. I don't know how the foglight ties in with the wire loom. That's still something I need to work out. The wires on my '71 foglights are very short at the fixture. Not sure if there's more slack inside the trunk.

It would seem that the 914 wire harness would include the wires right to the foglight as part of the harness.

[mepstein]

I have two early sets I can send you. One question, to remove from the car, where are the wires connected.

That's a good question. I don't know how the foglight ties in with the wire loom. That's still something I need to work out. The wires on my '71 foglights are very short at the fixture. Not sure if there's more slack inside the trunk.

It would seem that the 914 wire harness would include the wires right to the foglight as part of the harness.

So should I cut wires and plan on adding connectors or can I remove wires at the housing. I’ll do whatever you think best.