12V LED Lighting

by mread, published

12V LED Lighting by mread Jan 6, 2013

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This is a 12v LED spotlight which is used to supplement the led strip lighting above my desk.

Although the led strip light under the shelving provides a pleasant ambient light, I occasionally need a brighter lamp for reading or taking measurements. I do realise it would have been a lot cheaper and less time consuming to go out and buy a lamp, but, where is the fun in that!


Please note use only 12V ( or lower ) LEDs.

12V Halogen bulbs will generate significant amounts of heat and are not suitable.


Under no circumstances use this with mains voltage




4W 12 Volt LED MR16 light bulb


Rocker switch – sorry no part number, it was one I had lying around.

Chocolate block terminal connector – the metal inserts measure 10mm long by 4mm wide by 5mm high. The block has a pitch of 8 mm.

1 in-line fuse holder.

1 1 amp fuse

3 m3x12mm screws.

3 m3 nuts.

1 m4x12mm screw.

1 m4 bolt.

Wire, solder etc.


Parts were printed on rep2 with replicatorg0040 and using the profiles supplied by whpthomas.


Use wire cutters to extract the metal inserts from the terminal connector.

The MR16 light fitting connector has a pitch of 5.3 mm. Print the MR16 connector ( I used 100um profile for this part, everything else printed with the 200 um profile), and insert the metal connectors. Use your new connector to attach your wires to the bulb.

Clamp the bulb into the holder with the clamp and the three m3 screws and nuts.

I also printed a small switch box so I could attach it to my monitor with double sided tape.

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12V LED Lighting by mread is licensed under the Creative Commons - Attribution license.

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Excellent design!!!

Nice...Where does the battery go?

It's powered from the 12v rail in my computer. I have a home built system with a 750 watt corsair power supply, so there is plenty of capacity to power the three lights spaced on the shelf above my desk.

It also has the advantage that when the computer goes to sleep the desk lights go out as well. Nudge the mouse in the morning and the lights come on. I would n't recommend this unless you are sure your computer supply can handle the load, and an in-line fuse is a must.

Ive redesigned the shelf clamp, as the PLA tends to deform over time under load, and I have beefed it up a bit. Ill put the new bracket up sometime today.