Fully DIY Dimmable LED Lamp
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A dimmable high CRI (>90) LED spotlight with adjustable light cone and angle. Mounts magnetically.
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Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Full details, incl build123d scripts to generate the model itself, BOM (bill-of-materials), component swap notes, wiring notes etc. can be found on my github: https://github.com/jsmnbom/art-spot
Art-Spot
I needed a led spotlight for a container art installation my friend was putting on, and existing commercial options with similar features to this are incredibly expensive, so I decided to jump down the rabbit hole and design my own!
Features
- 95 CRI Cree COB, 3500K (any CCT/CRI variant of the CMA1303 drops in)
- Lens seats in a printed pocket: 12°, 24° (default), 35° or 51° beam angle Ledil CARMEN-50
- Flicker-free 0–100 % analog dimming (Mean Well LDDS-xxxHWB + 50 kΩ pot)
- Externally accessible Wago lever splices — daisy-chain several spots on one supply (a 19 V laptop brick runs four); zip-tie guides for strain relief
- Mounts on any magnetic surface via a pot magnet in the base
- Bayonet arm joint for aiming
- ~€30 in parts per spot
Printing
No supports should be needed at all! :D
Tested in ABS only; ASA should work just as well. PETG/PLA will probably work but may creep (heatsink warmth / constant arm clamping force) — expect to re-tighten more often.
I recommend using OrcaSlicer and simply opening the included lamp.3mf and using your normal slicing profile with around 3 walls and ~10% infill. It comes pre configured with overrides for strengthening the parts that matter.
Alternatively you can import the .step file. The objects should be named after my recommended print settings, but it primarily just comes down to higher wall count and infill for the arm parts that are likely to see increased stress. STL files are also included if neither .3mf or .step works out for you.
BOM
Here's a list of the parts you will need for a single spotlight. I recommend checking out the detailed bom in the github repo for a better overview and sourcing suggestions. Component pricing is hard to pin down, but I've included actual prices for individual parts when possible, if you're sourcing for multiple LEDs you should expect discounts based on quantity. Also note that shipping and taxes are not included.
Part | Estimated price | Link |
|---|---|---|
Cree CMA1303 COB LED | €3.40 | |
Ledil CARMEN-50 lens, 24° | €4.20 | |
Mean Well LDDS-500HWB LED driver | €9.25 | |
Wakefield-Vette 882-100AB heatsink | €4.10 | |
Bourns PDB181 pot, 50 kΩ linear | €1.10 | |
Wago 221-413 lever splice ×4 | €2.20 | |
Wago 221-412 lever splice ×2 | €0.90 | |
CSN-25 pot magnet (Ø25 mm, M5 countersunk) | €3.00 | |
M5×9.5 heat-set inserts ×6 (heatsink, magnet foot, star knob) | €1.85 | Hardware store |
Thermal paste, a dab (e.g. ARCTIC MX-6) | — | |
Hook-up wire | — | — |
Closing remarks
All in all it has been a really fun project and I hope it is useful to others :D
I've kept the license fairly restricted, but if you would like to do something that it forbids do send me a message or leave a comment and we can probably figure something out :3
The Pot4.stl included is from @Idee 3D (Alex Torres)'s Potentiometer Knobs, licensed under CC-BY-SA 4.0. I have included it here for convenience, and it should in no way be taken as me trying to re-license the file.