Is there a technical/trade name for the white plastic cups in some flashlights

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Gyronamics
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Is there a technical/trade name for the white plastic cups in some flashlights

I’m looking around and not sure if they’re custom pieces or I don’t know the right word.

So instead of a shiny reflector cup there’s a shallow white plastic cup around the LED/LEDs and maybe there’s a zoom lens in front or maybe that white cup is all the optics there is.

Any thoughts?

raccoon city
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Is it a white plastic reflector?

Gyronamics
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I guess it’s non-shiny reflector but I’m not able to search for such things as reflectors

For example:

It’s just smooth white plastic shallow cup.

zoulas
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Never saw that before.

The reflector should be like a mirror, not like the paint on the wall.

Firelight2
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Many zoomies have a white plastic washer or shallow cup on top of the star. This can accomplish a few things:

  • On some cheaper zoomies this washer has a fairly tight fit to the surrounding pill. It presses the star down into the pill, preventing it from falling out of position and giving better heat transfer. This is an inferior method of retaining a star than using screws, but is extremely cheap.
  • It also covers the top of the star except the LED making the front of the light look prettier when the light is off.
  • In covering the top of the star, it may reduce or even out reflections from objects on top of the star such as screws and bondwires. This may reduce artifacts outside the edges the beam in spot mode.

The white cup or washer is NOT a reflector

  • LEDs emit light in a wide cone out the front of the LED. In most zoomies, the shallow white washer or cup is actually flat enough that it sits below the angle of this cone.
  • In a reflector, the cone directly hits the sides of the reflector which then bounces the light forward. Since the white cup or washer sits below this angle, it is not actually a reflector. A very minimal amount of indirect light is reflected off it out the front of the light. It does not affect the main part of the beam in flood or spot mode.

As far as I know these plastic washers aren’t patented.

raccoon city
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One of my first quality flashlights, the Romisen RC-29, has one of those white plastic reflectors.

Gyronamics
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Perhaps they are too specific to the flashlight to be sold as a generic part.

Was thinking of a very floody light but I guess a literal white plastic washer would fit the majority of the bill of having a LED hole and tidying up the background.

NeutralFan
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You could just remove the lens on these from Kaidomain and use the white plastic reflector: PMMA OPTICAL LENS

I’d rather use my flashlight around the house than turn on the lights.

Gyronamics
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More along the lines of barely more than a LED behind a plain lens so I reckon a nylon penny washer (large OD compared to ID) is the easiest and cleanest way to do it.

They are very common and easy to get in assorted dimensions e.g. https://hw.menardc.com/main/items/media/RCSEM001/ProductXLarge/Washer_Pl...

raccoon city
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Firelight2 wrote:

The white cup or washer is NOT a reflector

For the Romisen RC-29, it is a reflector.

Maybe you're talking about something else.

JenkinsMatti
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Hmmm, if I read this correctly; it appears the Romisen RC-29 does not have a “reflector”.

https://budgetlightforum.com/node/5591

raccoon city
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JenkinsMatti wrote:

Hmmm, if I read this correctly; it appears the Romisen RC-29 does not have a "reflector". https://budgetlightforum.com/node/5591

According to that review, it has a "plastic magnifying lens" which I would argue acts as a reflector.

I would call it a reflector, and I think kreisler is confused.

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Firelight2 wrote:
Many zoomies have a white plastic washer or shallow cup on top of the star. This can accomplish a few things:
  • On some cheaper zoomies this washer has a fairly tight fit to the surrounding pill. It presses the star down into the pill, preventing it from falling out of position and giving better heat transfer. This is an inferior method of retaining a star than using screws, but is extremely cheap.
  • It also covers the top of the star except the LED making the front of the light look prettier when the light is off.
  • In covering the top of the star, it may reduce or even out reflections from objects on top of the star such as screws and bondwires. This may reduce artifacts outside the edges the beam in spot mode.

The white cup or washer is NOT a reflector

  • LEDs emit light in a wide cone out the front of the LED. In most zoomies, the shallow white washer or cup is actually flat enough that it sits below the angle of this cone.
  • In a reflector, the cone directly hits the sides of the reflector which then bounces the light forward. Since the white cup or washer sits below this angle, it is not actually a reflector. A very minimal amount of indirect light is reflected off it out the front of the light. It does not affect the main part of the beam in flood or spot mode.

As far as I know these plastic washers aren’t patented.

Thank you for the detailed, easy to understand; explanation.
JenkinsMatti
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raccoon city wrote:

JenkinsMatti wrote:

Hmmm, if I read this correctly; it appears the Romisen RC-29 does not have a “reflector”. https://budgetlightforum.com/node/5591


According to that review, it has a “plastic magnifying lens” which I would argue acts as a reflector.


I would call it a reflector, and I think kreisler is confused.

No arguments from me, I am simply trying to learn.

But I do not understand how a “magnifying lens” could also be a reflector?
Could you or someone please explain.

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raccoon city wrote:

Firelight2 wrote:

The white cup or washer is NOT a reflector


For the Romisen RC-29, it is a reflector.


Maybe you’re talking about something else.

I own the 16340 size version of the Romisen RC-29. It’s not a reflector. The angle of the cup is below the angle of the emission cone from the LED. As such, it doesn’t really “reflect” much light.

If you take the cup out the output will look almost exactly the same. Neither the flood nor the spot will be any brighter. However, without it, in flood mode there may be slightly less diffuse light outside of the floodbeam’s circle. And in spot mode, you may get artifacts outside the spot beam caused by reflections off the bondwires.

raccoon city
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The Romisen RC-29 definitely has a white plastic reflector.

I don't know about the 16340 version.

JenkinsMatti
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raccoon city wrote:

JenkinsMatti wrote:
https://budgetlightforum.com/node/5591

According to that review, it has a “plastic magnifying lens” which I would argue acts as a reflector.


I would call it a reflector, and I think kreisler is confused.

Can Raccoon City or someone please explain how a “magnifying lens” can be a reflector?

This does not make sense to me. I want to learn how this is possible.

Thank you.

raccoon city
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kreisler called it a "plastic magnifying lens," but it reflects light and I think it's a reflector because of that fact.

JenkinsMatti
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Does your lens magnify Raccoon City??

raccoon city
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Okay, I got confused.

There is a plastic magnifying lens, and that is completely separate from the reflector.

Sorry.

JenkinsMatti
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No problem, thank you; that helps my understanding.

Lightbringer
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Looks like a mule, only the white cup scavenges more side-thrown light and diffuses it forward(ish).

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Gyronamics
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First seller didn’t ship, second seller did ship and then it got stuck in “customs” for a month.

Got this one: https://www.aliexpress.com/item/32947942168.html

Turns out the torches which go for this white thing are diving torches often with suggestions of providing photography light, and it’s probably no cheaper than an aluminium reflector because on opening this one up it’s a machined white plastic cup in about a 90 degree cone.

You get a big puddle of even light as a “mule” does except this is a factory design and it has something instead of nothing where a reflector would be. I suspect the cup and the distance from the lens is to force a tighter puddle while keeping the lack of hot spots. If you instead rammed the bare led up to the lens it would have an enormously wide puddle.

4 modes on twist switch does not feel good scrubbing the double o-rings back and forth. I’m going to pretend the other modes don’t exist and or stick a single mode driver in there.

NeutralFan
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So did you get the flashlight that you wanted?

There are several ways to get a diffused beam, such as using a frosted lens or TIRs. Not sure why you wanted a white cup vs a reflector, but it seems interesting.

I’d rather use my flashlight around the house than turn on the lights.

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I think it’s acted as a gasket, to keep the LED centered and to press the led board (MCPCB) to the pill/body so that it won’t fall off. Never seen those plastic stuff on any website for sale though.

Gyronamics
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Kinda, the switch is less than ideal but it’s the light pattern I wanted.

There’s no pattern, no hotspots. It puts out light like a zoom but much wider, about a 4m circle of light at bit over 2m distance. Still much tighter than the super wide cone of a bare led.

I was thinking about the point of a hotspot in a flashlight at close range. You get a harsh brightness difference within the light which distorts what you see. So I went looking for a flashlight with no reflector and not a zoom either because it also bugs me that most of the head of a zoom is insulated from the led with o-rings. This is mostly one large piece and the endcap and it seems to easily manage the heat of using 11W on a fresh battery.

So this does a large even light puddle quite a lot like having a household light on and it does basically nothing at long range.

The shallow plastic cup is machined out of nylon rod I think. It’s not like the gaskets that go between an aluminium reflector and the led board.

The internal cone is steeper than the external one.