Anyone tried making a DIY round LED?

Enderman · 2018-06-11T21:34:57.000Z

Has anyone tried turning a square die LED into a round one by putting a mask on top?
Like a small piece of aluminum foil with a circular hole?
It would lower the lumen output a bit but the intensity should stay the same.

I’m sure this idea has been discussed before but I can’t find any pictures or threads about someone trying it.
The SBT-70 is discontinued, and the CBT-140 isn’t very practical or efficient.

djozz · 2018-06-11T22:01:19.000Z

As far as I remember it has not been tried, and some alufoil might actually add a tiny amount of luminance to the center bit by recycled light.

There are some leds however, leds with sharply curved domes like the SSL80 but also the 219A, that when focussed a bit above the die, so the focal plane into the dome, produce a round hotspot without visibly loosing luminance. It is an observation that I did but never did any measurements on it.

Enderman · 2018-06-11T22:24:01.000Z

Yeah I also thought it might increase luminance a little.
I was mostly thinking about this for flat LEDs like the black flat, CFT90, XPL HI, XHP35 HI, etc.
A sharp round spot would be perfect for zoomies without losing candela

Aluminum foil is the only thing I could think of that is super thin, doesn’t burn, and blocks 100% of light.
Idk if anyone else has other ideas.

Barkuti · 2018-06-11T23:03:33.000Z

Batsignals for the win!!!

How about carefully painting the dome with black permanent marker? And well, now that we're here mirror spray paint would be the best option imho because of light recycling phenomena.

Cheers :-)

EasyB · 2018-06-11T23:31:48.000Z

I usually do mods to increase lumens downrange. :smiling_imp:

Enderman · 2018-06-11T23:36:30.000Z

Yeah but there’s something about an aspheric LED thrower with a round spot that is so unique

CRX · 2018-06-12T00:54:23.000Z

Thought about it.
Managed a hex.

lights_and_pieces · 2018-06-12T06:38:04.000Z

I want a zoomie with a round spot. I’d like to find a few SBT-70 leds.

Enderman · 2018-06-12T06:46:30.000Z

If anyone knows where to find SBT70s please share

I might try putting a piece of foil with a hole over an oslon black flat soon to see if I can get a nice circular spot.

CRX · 2018-06-12T19:13:10.000Z

They are available, very pricey though.
https://www.mouser.co.uk/Mobile/Luminus-Devices/Optoelectronics/LED-Lighting/LED-Bulbs-Modules/LED-Lighting-Modules/SBT-70-Series/\_/N-b1b8h?P=1yylgmxZ1yzu5p9

sovereignknight · 2018-06-12T19:31:45.000Z

Just use a MT-G2. Works perfect in a Jaxman Z1. Love it.

You can also use a Nichia 319AT as well. I know both are hexagon but it’s the closest you get to round, minus an SBT.

lights_and_pieces · 2018-06-12T22:11:12.000Z

CRX, those are green and blue, color LEDs.

CRX · 2018-06-12T22:18:17.000Z

Right. I just did quick search on fone, didn’t check colour
I’m sure you can still get white, will have a look.
Aliexpress
https://m.aliexpress.com/item/32407291792.html

Enderman · 2018-06-12T22:47:07.000Z

sovereignknight:

Just use a MT-G2. Works perfect in a Jaxman Z1. Love it.

You can also use a Nichia 319AT as well. I know both are hexagon but it’s the closest you get to round, minus an SBT.

Hexagons are nice, not as nice as a circle though
I would use those hexagon LEDs if they had better cd/mm^2.

Enderman · 2018-06-12T22:48:52.000Z

CRX:

Right. I just did quick search on fone, didn’t check colour
I’m sure you can still get white, will have a look.
Aliexpress
Page Not Found - Aliexpress.com

Oh cool, thanks.
$70 though lol

CRX · 2018-06-12T22:50:28.000Z

Nice lookin emitters though

vt2nv · 2018-06-12T22:51:21.000Z

Jacob A60

Ronin42 · 2018-06-13T21:49:39.000Z

CRX (The master of cool units)

If you could help me figure out how to get these emitters t work that would be so cool.

Maybe a 2018 Custom build contest entry?

” Who can figure out how to use these 95CRI 3000K massive emitters”:Who can figure out how to use these 95CRI 3000K massive emitters

Ronin42 · 2018-06-13T21:51:22.000Z

Enderman:

If anyone knows where to find SBT70s please share

I might try putting a piece of foil with a hole over an oslon black flat soon to see if I can get a nice circular spot.

Maybe THE SORAA emitters will work Or are the TOO LARGE?

Enderman · 2018-06-13T22:18:44.000Z

Ronin42:

Maybe THE SORAA emitters will work Or are the TOO LARGE?

Those are COBs, not single die LEDs.
Round COBs are not new, there’s tons from cree and citizen.
They are for producing a lot of lumens, they suck for flashlights because they require very high voltage and also have a huge die size and low intensity.