New surfacing tools are nice

billy2

Here's the newest version of a BMW tail light assembly using Onshape new surfacing techniques. Is it worth it?

I think so.

I'd like to thank @S1mon for hounding Onshape so they'd clean up curvature combs making them useful. 

Curvature combs used to create the main surfaces:

lana

Looks really nice!

+1 on Thank you @S1mon

billy2

Thanks lana

Can a tail light on a motorcycle be too bright?


60% of accidents between motorcycles & cars, the car driver say they didn't see the bike.

So the answer is no, light'm up and make'm visible. My new light is 21 watts.

 

adrian_vlzkz

Nice work Bill!

billy2

Thanks Adrian

nick_papageorge073

Nice surfacing!

Off topic, if you’re looking for a diffuser material to hide the individual LED’s, I have a great source I’m using for two light subs on my production project. 

 

billy2

@nick_papageorge073 I'd like to see your diffuser material. I've PM'd you my login, can you share with me?

nick_papageorge073

billy2 said:

@nick_papageorge073 I'd like to see your diffuser material. I've PM'd you my login, can you share with me?

yes, I have a video too where you can really see how well it works, without the auto white balance of the camera lying to you. I must have tried 20 different materials and nothing was even close. I’m in Peru on vacation. Will dig up video and send later. The material is from luminit.com. My company hired a lighting engineer consultant a couple years ago and he turned me on to it. This is the exact one:

billy2

I've ordered a sheet, they look great and will take a look.

These are my current lenses:


I'm currently using the clear lense. Typically the use case is a viewing distance of 10 meters and individual LEDs are hard to distinguish. The other issue with my use case, they get dirty fast. The rear tire is throwing dirt on to the light all of the time and I'm constantly cleaning them.

Have fun on trip and please send video on return, sounds interesting.

steve_shubin

@billy2

Billy, I’ve been interested in your tail light development. Really like how you’re able to get such a good fit using your scanner

But I got to wondering about something

A little after it got dark, I noticed my neighbor had his new Tacoma out in the street with the hazard lights on.

So I went out there to get on axis with those rear blinking lights.

At 70 feet directly behind the truck, the red tail lights were easy to look at. Not much of an output on that vehicle’s hazard lights

Now the thing that I started to wonder about, was that I was curious to know how auto lights compare with one of the newer flashlights. So I figured I’d get one of my flashlights to see.

The light I chose for my test, an Olight Marauder Mini, has one white LED for spot. Six white LEDs for flood. One red LED. One green LED. And one blue LED. And this light has TIR optics

Using the single red LED only for this test, I turned it on to the high position and walked out to a distance of 313 feet

That flashlights single red LED was monstrously brighter at 313 feet, than the Tacoma was at 70 feet. I figure that single red LED with its TIR optics might be effective out to 500 or 600 feet or maybe even more. But because of the bend in the road, that was as far as I could get for the moment

I also got off axis with this single red LED by about 11° and it still was effective. Not as effective as when viewing it more on axis, but still very effective. I would’ve tried to get off axis more, but the vegetation didn’t allow.

Now Olight — the maker of that flashlight, has not published the make of the LEDs

But there is some speculation that the colored LEDs might be Osram

So I was curious to know if you had tried any Osram LEDs

Here’s an article that speculates on the make of the LEDs

Flashlight Review: Olight Marauder Mini

steve_shubin

Here’s the weird thing, in that article in the link up above, it says that the red light is in the orange red area (620nm)

And on the highest setting, the flashlights red LED only puts out 200 lm.

If you go to the Osram site, most of the red LEDs near the 200 lm range are between 2.6 to 4.2 watts

Which makes me think that if you had your 23 watt inside of a similar TIR that this flashlight has, I’d probably be able to see it VERY WELL at a half mile

Or there’s something that I clearly don’t understand about how flashlights work. Because if that little LED in this light is only around three watts or so, why is it so doggone bright to the point of my not wanting to look at it for very long when on axis even at 300 feet.

Mind you, that the TIR may have a bit of throw to it. But it does have some spread also. If you look at that article above, you can see the guy shining that light out in the woods.

So what’s going on here ???

Hardly any watts and bright as all get out.

Stumped

steve_shubin

I think things are starting to come back to my old mind. LOL

https://budgetlightforum.com/t/my-understanding-of-emitter-die-size-in-relation-to-throw/48831

But even if the combination of smaller chip to TIR in this flashlight does have some throw. It still does have some bit of flood and you could tell from the pictures in the first article.

billy2

@steve_shubin

I'm lucky to have lived through the time when LED's were replacing HID lighting and have designed many light conversions. I got tired of an inconsistency light output lux vs. lumens so I started using watts to compare LEDs. That's the common denominator for me, it's probably not a good way to pick bright LEDs but one thing for sure the brighter the light the hotter it gets. I also have to make sure things don't catch fire so tracking thermal is a good thing.

Your light is a different problem, it's a focused light, running on limited power and not running through a diffuser. I have unlimited power but have to worry about thermal loads. You can't hold my lights when they're running. I'm trying to emit a ball of light and when you're beaming. I'm trying to run in daylight and be seen. 

Focusing the beam and trying to get a flashlight to shine for 2 miles is tricky because the source from an LED isn't a point. Parabolas work off a point source. Smaller LEDs have 1mm x 1mm source, the one I use has 4 of these so the size is 4mm x 4mm. The optics is a mess and I pick one from the supplier. I'm not sure I want to focus the beam but would rather want the flood effect covering 120°. My tail light doesn't create a pretty prenumbra which is how we judged our focused light. We were looking for a tight transition between light & dark when shining a beam on a wall, it wasn't scientific at all.

I'm using a Luxdrive which is the brightest led source I can find at this time:




This is a single Luxdrive with 19mm aperture.


I've followed this bike on an interstate and you do see it amongst all the other car lights on the road. It's not too much and I have it tuned to about a 1w running down the road. When I hit the brakes, its 9w. You do see a difference.

Look at the end of the handle bar, this is where the British have started to put their turn signals, it's legal over there. These are Kuryakyn lights from a well known bike parts manufacturer. You can't see them on the road. They work great when you're in a garage.



There's a lot of crazy guys out there building motorcycles. 



There's starting to be a buzz that LEDs on motorcycles aren't bright enough, it's not just me.
 

dirk_van_der_vaart

Not only on motorcycles, in bright sunlight you see a lot of new car's with very poor light's.
And it's not only how much Lumen the light is it's also about spreading the light trough a diffusor, mostly an acrylic molded piece.
Here an example of very bright led's
https://nl.aliexpress.com/item/32827569920.html

billy2

@dirk_van_der_vaart

I use that style of led on forward signals. They are bright and it's hard to see the individual LEDs. China is producing amazing LED products. 



The LEDs I buy are flat strips and I heat them up and bend them around the upper fork tube. They are bright and it's hard to see the individual led through the diffuser. I buy a lot of LEDs these days looking for the next technology. I focus on the spreader, the aluminum backer that the LEDs are mounted to. I have to have this to dissipate the heat. Optics are one thing, but LEDs are a mechanical problem, how do you manage the heat. Newer motorcycles are shipping with larger stators because everyone is wearing heated gear and bikes have to create more electrical power. Heated grips, handlebar heating takes up more power than all the LEDs on any of my bikes. A bike has plenty of power to run LEDs.

I called the diffuser company that @nick_papageorge073 told me about and spoke to them for over an hour about lighting up bikes. What a great company and I bought a bunch of stuff which hasn't arrived yet. Their diffusers, you lose very little brightness because their crystals are magical. I have no idea the physics behind the diffusers they make.

I'm excited about these new diffusers which will probably prompt a new version of lighting for my motorcycles.

I'll post how these new diffusers perform after they arrive. 

nick_papageorge073

@billy2, I just sent you an email. Hope it's helpful! Nick.

steve_shubin

Heat

Yup. Definitely an issue.

It was an issue when I was using my Nightsun xenon mountain bike set of head lights back around the latter part of the 80s. Could not use the high beam without moving. Had to have air passing over that light.

And for us folk that like our HANDHELD lights (flashlights), it can be an issue with us.

Some of the reviews on various high-powered flashlights will tell you that you’re going to have to use a glove if you use such and such a light for an extended period of time

Some of the brightest lights have fans built-in. In fact, the one that is at the top of the heap right now, has an intake fan blowing across a radiator, and an exhaust fan on top of that.

Go to the two minute mark of this video to see what handheld is capable of —

https://www.youtube.com/watch?v=ZUOs_JNd0_E

So yeah, heat is that problem

But after viewing my single small Red LED at over 300 feet at night, and having tested it out to over 140 feet during the day, I’m pretty sure an array using TIR optics, splayed similar to your setup would be able to get the job done.

I would’ve tested it to further than 140 feet, but I was doing this in the yard and it was kinda inconvenient to get further

BUT BUT BUT — I could CERTAINLY understand that designing an optimized paraboloid to work with the tiny emitters may not be the easiest thing to do.

The reason why I’m kind of elated with this idea is because if we’re talking about using five emitters at about 3-1/2 watts per, we’re talking somewhere around 18 watts total. But I don’t know if you’d even be running it anywhere close to that for braking. For other than braking, the watts are going to be way less. Which makes me think that heat might not be such an issue if someone were able to get this type of design to work in a tail light. Just a thought.

Seeing you’re interested in the next of technology, keep an eye out for the LEP lights. The laser excited phosphor lights.

Now these laser excited phosphors are not the same as looking at a laser light because It is actually the light of the excited phosphor that is being projected

At the first link below, you may have to scroll down until you get to — 

Questions about LEP flashlights

https://1lumen.com/lep-flashlight/

Guide to LEP Flashlights

Right now they’re being used only for extended range spotlights or throwers. And they do throw a tremendous distance. But I was reading how one of the makers of these lights, is trying to develop a wider spread. More of a flood.

Granted it’s going to be way too bright as is. But if a flood version is ever developed on top of possibly pairing it with that crystaline like diffuser used on those COB LIKE lights that Nick brought up, you’d probably be able to crank this thing way way down and still get amazing light

And cranked down far enough would make me think — not much watts

Here’s a video of a LEP in action 

https://www.youtube.com/watch?v=1Pwogzi_nCc

dirk_van_der_vaart

Here is some information about different sort's of diffusors
https://shop.pyrasied.nl/product-categorie/lichtdiffusers/

billy2

@steve_shubin I've spent the morning researching LED's based on your suggestions. 

-I'm using a cree xpE2-red which is 201 lumens. It's good for me because it comes mounted to an aluminum substrate. 
-I've looked up cree xhp series which are white and very bright. I only found individual LEDs meaning I'd have to design the spreader which I've done in the past, but currently not really interested in doing that. 
-LEPs are scary (lasers), these would be illegal to have on a motorcycle. But I want one.

It'd be fun to take a ms18 (uses a cree xhp) apart:
-I found a video and this might be the spreader

This looks like a copper substrate which is better than aluminum. More expensive too.

-I also found a heat pipe article

You can get 10x-100x heat flux improvement over solid copper. They said in a video they're pulling heat from the spreader with a heat pipe.

Then they use a fan & forced air which is the worst part of the thermal path. The packaging is really interesting but I can't find one disassembled, infact, I found references to them being destroyed to take them a part. At $700 bucks, I'm not that curious.

@dirk_van_der_vaart
I went through their website and will order some cylinders. These would be easy to incorporate into a design. I like that they have a thermal forming material which could easily turn into a limited production run. 

I'm still not understanding why acrylic is better than polycarbonate? Most plastic lens are PC on bikes for durability. Can you read their website? I'm not opposed to acrylic if it's a better diffuser.

@nick_papageorge073
I didn't get an email. It's my fault, my rndengineering server uses a "let's encrypt" certificate which expired and I need to reboot the server. This is my problem and I sent you my current email in a PM update. I need to update my Onshape login so everything works.

steve_shubin

@billy2

Like you Billy, I thought LEPs weren’t in the car world, because those pencil beams would create havoc. I thought they were primarily the realm of flashlight junkies

Then I read how autos were one of the first with LEPs

Some crazy company named BMW pioneered their use on cars, and that they worked with Osram to make it happen

The article below says that they’re four times more powerful than LEDs.

Laser light for headlights: latest trend in car lighting | OSRAM Automotive

Evidently they figured out how to make them more than just a pencil type of beam, that is, if they’re using them for headlights.

I wonder how they’re dealing with heat on these things. How about these lights when they’re sitting in traffic and not going anywhere at night. And there’s no wind movement over them.

Maybe it’s because the LEP is not confined to an enclosure with these headlights. Maybe part of the LEP is exposed on the backside — on the engine compartment side to where that heat is able to escape into the engine compartment.

Be interesting to go find one of these cars, pop the hood, and see what can be discovered about these lights

All the LEPs I see being manufactured right now are white light. But a paragraph from one of the articles in one of my above posts got me to thinking that there can be such a thing as red light LEPs

Here’s that paragraph —

A Note on Efficiency

One thing that sets LEP lights apart is the incredibly high efficiency of their emission, requiring less power for more light than other sources. This is due to the utilization of blue light. The typical drive current required to produce desired light intensities in blue lights is 4.2 mA, as opposed to 8.8 and 10.5 mA in red and green lights respectively.

Then I found an article where it talks about europium-containing red-emitting phosphor

Laser excitation of red, green, blue and trichromatic white rare-earth phosphors for solid-state lighting applications - ScienceDirect

I’ll take some time later to read the rest of this article

I might take a little time to see if there’s red LEPs being marketed right now

And going about it a different way. Here’s a guy using filters for color and he’s also getting a larger beam with a diffuser on his LEP

https://www.youtube.com/watch?v=LUEuZ848jp8

Addendum —

So if there is such a thing as a red LEP, and if it is powerful, then the idea is to turn it down. And along with what has been discussed – start with something that’s bright, but turn it way down so you’re using less watts, and as you’re limiting the watts, you’re cutting the heat way down