Electronics > Projects, Designs, and Technical Stuff
Sourcing 5mm RGB LEDs for LED Cube
djacobow:
--- Quote from: Jan Audio on December 26, 2019, 02:05:43 pm ---Big chance they all the same.
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This. But regardless, LCSC is legit and the LEDs will arrive packaged properly and they won't be floor sweepings. Can't say the same for eBay and AliExpress.
And you just don't want to buy LEDs from legit US distributors. The pricing is not acceptable for "LED heavy" designs.
mariush:
You should consider surface mount leds.
Here's a couple examples:
1206 https://www.tme.eu/gb/details/rf-w2s155ts-a41/smd-colour-leds/refond/
1204 https://www.tme.eu/gb/details/rf-w2s118ts-a41/smd-colour-leds/refond/
The first one has something like 1mm or 1.27mm spacing between the half-holes , the 2nd one is even narrower ... both could be used
You could custom make a circuit board for each "level" in the cube to hold the 64 leds of that level (have traces on both top and bottom of pcb to make the lengths of pcb thin
The first led could also be soldered onto a pcb that has through holes you could just have a bit of copper wire come out the pcb and you'd place the led and just put a drop of solder to connect the wire to the led.
tooki:
--- Quote from: Oleenick on December 27, 2019, 11:52:16 pm ---
--- Quote ---Yes, cd or lm numbers for green LEDs are higher even if the LEDs happened to be of same power efficiency (% of converted into energy of photons), because cd, lm units exist to describe perceived brightness as per human eye's sensitivity curve.
If you want neutral white out of an RGB LED, or similar-looking red, green and blue indications, you need to tune the currents. If you have full digital brightness control, then this is easy with software. If you don't, play around with one of the LEDs first to find best series resistor values per color before assembling all 600...
Random Ebay LEDs are high-risk items: they may be OK, but they may have high failure rate, which would be definitely a problem at qty 600, and not verifiable by sampling a few.
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Thank you thats a good clarification. I'd be testing them all before I used any of them to check brightness against a standard. But do you mean a high failure rate in that they will fail quickly or that they will be dead on arrival? Since I'm ordering 1000 and I only need 512, that should help.
I'll be running them at constant current as well so I can tune the current to match colour channels if needed.
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In the case of an LED cube, the concern isn’t DOA LEDs, but rather the longevity. Since replacing an LED in a cube is extremely difficult, you don’t want to risk LEDs that don’t last long. So I’d avoid random eBay sellers, and use LCSC, or at minimum the eBay/Ali store of an LED vendor that’s been around a while.
--- Quote from: mariush on December 28, 2019, 05:19:25 am ---You should consider surface mount leds.
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That makes no sense. Using PCBs blocks the view. Additionally, for an LED cube, you want a diffused LED body to blend the color of the 3 LED dice within the LED, as well as to provide a wide viewing angle. SMD RGB LEDs simply aren’t large enough for this blending to occur, even if they use diffused epoxy, and SMD LEDs tend to be much more directional than diffused THT LEDs.
StillTrying:
An 8 x 8 x 8 Coloured LED Cube seem like a job and a half to me. :)
Min. 200 outputs ?
https://www.instructables.com/id/Led-Cube-8x8x8/
Jan Audio:
If you gonna build something like this, you need at least a 3D printer with transparant filament, or some plexiglass around it for the case you squash your thing.
Good luck, place some pictures in the year 2021.
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