Rover SD1 Rear Light conversion to LED

[Suddabym 430]

So, I'm just in the process of getting the rear lights fitted to my S2, converted to LED (Rover SD1; in case you're not aware, are fitted to S2, S3 and Turbo models).

This is quite involved, requiring the cups on the rear of the light unit removing and PCBs (Printed Circuit Boards) making up for each (massive) individually lit area. Overall, each unit (side) will have between 250-300 CREE LEDs.

I don't have any photos of the finished article because they are currently being made up.

I mention this now, as a bulk order (any more than one) reduces the cost (as the PCBs can be printed in a single run, bringing the cost down considerably).

So, if anyone is potentially interested, please PM direct and I'll outline the plan, costs etc.

I very much suspect that it won't be of particular interest, but I seemed sensible to make the offer, before the designs are sent off for printing.

Of course, the option exists to get these done after I have mine (and I'd be happy to share who I used etc), but the cost will be up at the single order level.

Awe. Some.

(pic for something to look at only)

[drdoom 397]

Intriguing idea, Mark, should have real impact. I went to the trouble of adapting LED bulbs via a less drastic manner and the difference is notable.

[skiing 107]

I also have LED bulbs in mine - usefully brighter I think. Would be interested to see how this looks - do you have any images etc. of what you are aiming for roughly? (other cars with a similar conversion etc.)?

[slewthy 249]

Just replacing with led bulbs with no modification is definitely better but still results in a point of light behind a large lens. The nighttime running lights are also quite small. Whole lens lit would be interesting to see.

[jep 842]

I love threads like this. 

I have zero desire and further don't even understand why anyone would want to have LED lights, particularly at the back of the car.

I do though enjoy reading the topic and greatly admire the ingenuity and skill of all those doin' the muckin' on tasks like this.

Meanwhile, I will go and drive my Lotus - and hope others can see me in the dark.

Justin 

 

[skiing 107]

It is always intriguing. For me LED bulbs are for lower power drain, greater reliability and enhanced brightness - the rear SD1 derived lights on the S2 and S3 Esprits / Elite / Eclat and Excel are not known for their brightness - perhaps less of a challenge on the later cars I would think. 

[jep 842]

Does the metal reflective coating not flake off, making the light less bright?

I drove my Excel in to my Elise and broke the lens on the Rover light. I was surprised how expensive a replacement was - luckily a friendly Excel owner sold me a spare for not much. Fitting it was a challenge but we did remember to drill a new drainage hole as the SD1 lights are mounted upside down on Excel. 

The reflective coating appeared quite worn on the one I removed.

Justin

[Suddabym 430]

You're all right, of course, which are the issues that I am trying to solve.

I first replaced the industrial revolution bulbs with LEDs all round and the difference (while better) was still a single point of light almost lost in a sea of coloured plastic.

The plastic reflective interior of the cups does indeed become dull and peels. Mine were rubbish, but hardly surprising after 40 years. So the idea of light reflecting about, even from LEDs bulbs does not have the effect that it once would have, or should.

So, that's why I am getting these banks of LEDs made up. The lit areas are huge, so why not make use of it, is my thinking. Plus, I am getting the PNM LED headlamps fitted at the front as well as some (made for the Mini) LED PCBs fitted to the front bumper lights (my side repeaters are already LED).

All this I will post up on my S2 Restomod thread, once they're all done (which will then mean that the car will be finished).

The pictures below do not (NOT) show what the lights will look like. These are mockups that I made to confirm that they would fit, both in the lenses etc and back onto the car, before I ordered the PCBs.

But, they give some idea to what I'm thinking.

What I have learned is that the solution to lights is not lighting, but electronic.

Boom.

[drdoom 397]

Very smart appearance from the outside, rather different inside though your intent to create circuit boards will sort that out nicely I'm sure. Can't fault the arguments presented in support of this project and, given the attention deficiencies on show in traffic these days, I think a high impact from the rear lamps is a positive. Nice thing about the Esprit is it remains aesthetically a supercar, affording latitude for modern enhancements which would be less tolerable on cars of a more vintage character.

Cheers

[Suddabym 430]

Yes, the reality is that while these cars are all classic and of their time and stuff, they drive on modern roads in amongst modern and massive SUVs, and people who are looking for light produced to their expectations. And I’d rather give them that than find them in my boot getting to know my engine. 

And, I agree; I think the car can be modernised in a way that an Elan or E Type couldn’t be.

[Suddabym 430]

204 per side. Which is better than five per side.

[Fridge 940]

Impressive.

Did you replace the actual lenses (outer red/amber coloured things)? @Lotusfab did this on his Bond Turbo under @stephenwhyte advice. I believe they resulted in a noticeable increase in light. They'll make a big difference, especially if going to this trouble, as light diffraction due to micro-scratches in 40 year lamps will diffuse any light that is produced (essentially beias ng a lighting camerman diffusion is one of the tools of the trade).

You may also want to run the changes by your insurer as light mods of any kind can invalidate your cover. Just a thought, as I know how much money goes into these restorations. Insurance companies will find any route to weasel out of a claim.

[Clive59 115]

Great project. Looks like you are using Through Hole parts? Any reason for not making them SMT and easing manufacturing cost? How are you driving the LED's? Constant current is probably preferable. Keep us posted on progress.

[Suddabym 430]

So here they are, and I'm very pleased with them. Note that the tail/brake lights are merged to operate as a single bank of lights (shown here is tail (brake is so bright it forces the camera into dark/flash mode).

[Suddabym 430]

David - The lenses themselves are unchanged. They were in pretty good nick to begin with and if I need to improve the outside (because of scratches) I'd polish them out (easier now it's just three strips). The inside the the lenses are fine.

Clive - I have absolutely no idea what you're talking about  Hopefully the answers are obvious to you from the pictures.

The PCBs are professionally made and sealed boards and the LEDs are all good quality CREE. The load is likely less than the original bulbs and the brightness (in the flesh) is extraordinary. However, I don't pretend that that isn't anything other than an amateur attempt to improve the rear lights which are currently dangerously rubbish. Plus, they better match my high rear brake light, LED headlamps (PNM) and LED front side/turn light units (mini clubman).

Next - fitting.

[Clive59 115]

4 hours ago, Suddabym said:

I have absolutely no idea what you're talking about

Mark, did you do the circuit yourself? I can see the red and white ones have some resistors, and diodes on the boards, so presumably some current limiting there, but orange ones do not? LED's don't like overcurrent, and life will be significantly shortened if over-driven. As the voltage will vary quite a bit, say 12.6-14.7 at least during normal operating conditions, much wider if say hazard lights on in emergency and you really want them to keep working till battery essentially goes flat. So, if you drive them with a constant current source, it will ensure illumination is same for all voltages, and ensure LEDS don't get cooked so maximising their life, which should be much better than 20,000 hours typically. This adds to complexity of course, and most if not all modern auto LEDS would be designed like this. Efficiency also higher, minimal heat losses etc...

Just asking, so you don't suddenly find unexplained failures in the future.

[RobinB5 245]

On 26/11/2020 at 13:03, Clive59 said:

Great project. Looks like you are using Through Hole parts? Any reason for not making them SMT and easing manufacturing cost? How are you driving the LED's? Constant current is probably preferable. Keep us posted on progress.

@Clive59, looks like @Suddabym's final boards have SMT LEDs. Looks neat.

[Barrykearley 6,833]

Looks fantastic - well done 

[Suddabym 430]

Clive - the boards are professionally made by an expert in making LED lights for classic cars (mainly American cars). So, accepting that, I am fairly sure that they meet the points that you make, but again, I’m not an expert. The circuits are sandwiched in the boards and all are the same. Strangely, that one turn board in the picture is reversed, which could be a manufacturing thing with the turns being the only ones that are bank specific. There is a resistor (with the appropriate resistance) per 4 LEDs, and the bulbs themselves are top spec. So I’m comfortable that they can handle the usage they’ll have in the car.  I cannot, I’m afraid, talk technical. Life is risk, right? Time will tell how awesome they are, but unless we try, etc...

[Barrykearley 6,833]

Not rocket science @Suddabym - sounds like the maker knows what they are doIng - and the result looks damn smart.

It’s not like they are using something that isn’t fit for purpose

[Clive59 115]

2 hours ago, Suddabym said:

the boards are professionally made by an expert in making LED lights for classic cars

That sounds good Mark. Good luck with it, hope it works well. Can you let us know roughly what the units would cost if you got a batch made?

 

 

[Suddabym 430]

Thank you all for your encouragement. They are what they are. I’ll post up (in my restomod thread) once they’re fitted.

And then  hopefully next year, I’ll be able to get out to meets.

Sma. Sh.