Emil's Projects & Reviews

OpenHardware & OpenSource

Desktop LED Lamp 2nd April 2014
Assembled Desktop LampDXF design file (QCAD)

Since I haven't found any suitable and reasonably priced LED lamp on the market I've decided to build my own. Bellow is the price breakdown of the components. I'm not counting some 10h of labour to machine parts and assemble the lamp.

Aluminium Radiator (salvaged from old GameCube)x1$0
Aluminium Machined Joining Part (from 12mm plate)x1$1
9W LED COB Chip 27-32V (40mm)x2$5
300mA LED Driver (9-12W)x2$5
Aluminium Case 30*88*120mmx1$10
M5 Allen Bolt Cap Screwx1$1
Rocker Switchesx2$1
30cm Carbon Fiber Tubes (4mm ID, 6mm OD)x2$7
1m AVG20 Silicon Wire (red+black)x2$2
3m Mains Cable (salvaged from old appliance)x1$0
Nylon 20mm Rod (90mm long)x1$2
Cabinet Hingex1$1
Lead Ballast (Ingots) x1$2
M4×10mm Sunk Screwsx4$1
Tapered Screwsx8$1
M4×5mm Grub Screwsx4$1

The lamp is extremely bright, it exceeds 5000 Lux on the desk surface with both LEDs turned on while it only draws 20W of power. The carbon tubes can bend between 45 an 90 degrees to adjust the distance to the desk surface. One (small) disadvantage is that the radiator gets quite hot and you can burn your hand or forehead if you touch it. I've measured 48oC and 62oC with one and both LEDs turned on.

First I've machined the aluminium radiator and joining parts, I've tapered the screw holes and cut the carbon rods to length. Then I've soldered the silicone wires to the 2 LEDs before fixing them (otherwise you cannot properly heat the solder joins). I've fixed the LEDs on the radiator by using some thermal paste for proper heat transfer. The aluminium base needed some light machining too for the bolt, carbon tubes and switches holes. The most difficult part to manufacture was the nylon rod because it required an off-center long and parallel hole. I've used a pin punch and a hammer to slightly deform the hinge to make it difficult to move and keep the lamp head steady. The base wiring is straight forward with each switch controlling one constant current supply (one per LED).

Mounting the LEDs on the Radiator
Assembled Lamp Head
Assembled Base
Swinging Nylon Rod Support
Constant Current LED Supply
Machined Base Top Plate
Base Front View - Detail
Base Back View - Detail
Lead Ballast Attached to the Back Plate for Increased Balance
Assembled Desktop Lamp
Luminosity Measured with a Lux Meter
Power Consumption with both LEDs On

Tags: illumination, led.

Comments On This Entry

Carlos do Prado Submitted at 15:29:29 on 28 August 2015
Dear Emil,

Great project. Simple and functional. Congratulations !

I also like the "Making a better HC-SR04 Echo Locator" project. I´ll try it.


Prado from Brazil

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