Anyone tried making a DIY round LED?

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.

Iā€™m sure this idea has been discussed before but I canā€™t find any pictures or threads about someone trying it.
The SBT-70 is discontinued, and the CBT-140 isnā€™t very practical or efficient.

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.

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 :slight_smile:

Aluminum foil is the only thing I could think of that is super thin, doesnā€™t burn, and blocks 100% of light.
Idk if anyone else has other ideas.

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 :-)

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

Yeah but thereā€™s something about an aspheric LED thrower with a round spot that is so unique :open_mouth:

Thought about it.
Managed a hex.

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

If anyone knows where to find SBT70s please share :slight_smile:

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.

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

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 itā€™s the closest you get to round, minus an SBT.

CRX, those are green and blue, color LEDs.

Right. I just did quick search on fone, didnā€™t check colour :blush:
Iā€™m sure you can still get white, will have a look.
Aliexpress
https://m.aliexpress.com/item/32407291792.html

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

Oh cool, thanks.
$70 though :confused: lol

Nice lookin emitters though :smiley:

Jacob A60 :smiley:

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?

ā€ Who can figure out how to use these 95CRI 3000K massive emittersā€:Who can figure out how to use these 95CRI 3000K massive emitters

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

Those are COBs, not single die LEDs.
Round COBs are not new, thereā€™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.