24 Watt LED Lamp.




Introduction: 24 Watt LED Lamp.

About: Now I am a retired person, who enjoys life and making small things to pass the time keep myself busy.

This high power LED lamp is made out of a discarded PVC pipe of 110 mm diameter.

I have used 24 numbers of 1 watt LED’s which gives a powerful light, and is very good for lighting up your work table when you

require more light to do some intricate work.

Step 1: Parts You Will Need.

1. AC Transformer 12 volts by 2 Amps.

24 numbers 1 watt LED’s.

1. Capacitor of 470uf 35 or 60 volts.

4. Diodes 1N 4007 for bridge rectifier.

1. On Off switch.

Wires, solder etc……

Take a PVC pipe and cut it to your required length, the Diameter of the pipe should be big enough to fit in the Transformer.

Step 2: PVC Pipe

Cut the PVC pipe from the top leaving about 4 inches from the bottom

to place the Transformer, as shown in the diagram. Fix hinges on the top of the cut

out portion so that it opens and closes as per your need.

Step 3: Flat PVC Sheet.

Now take a flat PVC sheet and cut it to the required size to fix the LED’s on to it.

Fix Four rows of 6 LED’s with Dendrite so that the LED’s stick to the PVC sheet.

Make small holes on the sheet to connect the LED’s with wire.

Step 4: The Circuit.

Follow the Circuit and solder the LED’s and connect it to the output of the Transformer.

Place the switch where ever you want.

Step 5: Placement.

Here you will find how the LED panel and Transformer is placed.

Step 6: The Lamp.

Here you can see the Closed and Open positions of the Lamp.

Now your light is ready, Plug in, switch on and Enjoy….

Step 7: Wall Fixture

You can also hang it on the wall.



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    33 Discussions

    I love the look and design of this one. Putting it on my list of things to do.

    Why can we not use 1 watt led instead of these leds as you mentioned in comments to someone when he asked for without transformer option. For 220v direct circuit supply is applicable for same leds? and how?

    1 reply

    I would like to have the circuit of 1 watt LED which runs on directly 220 volt AC without Transformer. Please send me......Thanks

    Missing the important step, showing how to fit the hinge at top, the lamp end cap, the circuit cover for the base, and... was the whole unit painted except for the stripe? Or is that pvc dye?

    8 replies

    It is PVC dye, the white strip is a PVC tape. You can make your own Hinges and fix it as you like. I have cut a piece of the same material and fixed it with screws.

    how to use a/c and d/c i.e., by using a charging battery or old mobile battery to drive in circuit ( for 1 watt led)

    by both on ac and also to use when no power on battery

    Driving 24 LED's of 1 watt by battery is not advisable as it will drain out the batteries very soon............

    i understand ..

    i just need atleast 3 to 6 leds

    to use both as from ac and battery (mobile nattery as charging battery)

    With careful choice if led element...
    Get an used, but newish cellphone (galasy s3, or newer with a large screen. Can be cracked, but circuitry must still work).
    Modify the shell, to let you run wires directly to the battery terminals.
    Run one of the wires to a switch, then led terminal 1. Wire 2, directly to led terminal 2.
    Run the phonecharger inside the lamp body.
    Wire the leds in parallel.
    As long as total draw from the leds do not exceed the safe battery output, it should work. 3 leds drawing 1/2 watt each at 3.5 volt SHOULD run safely off a 3.7volt2200mAh cellphone battery for bout an hour. Maybe. Or a single 1 watt led for 45 minutes to an hour.

    You would be much better off using a 6 or 12 volt sealed lead acid battery, matching the number of series connected leds to the battery voltage (2 for 6v, 3 plus current limiting resistor for 12v), and using a charging circuit to keep the battery topped off ( using an automotive trickle charger, for instance. Or the charging circuit from an old UPS). The number of led series you can wire in parallel would be determined by the battery capacity.
    A 12 Volt 6 Ah Electric Scooter Battery should be able to drive a 3s8p array of 1 watt leds at full brightness for... maybe 3 hours on battery only, if my math is right.

    thank u for the reply

    i have tried it with my battery bank batttery 2600mah 3.7v battery

    and charging it with mobile charger used a diode for charging in one direction

    and battery connect to led for lighting the bulbs with switch

    Ahh. Cellphone battery bank.
    At 2600mAh, they put out 5 volt, 1 amp, for just over an hour. At least mine does. It is built in china using a 2300mAh 18650 cell.

    Using those, you will want to look at different leds.
    A parallel string of ultra broght white 5mm leds, with a current limiting resistor.
    Good, bright ones, will draw around 15 or 20 mA each, so well within the limits of even the cheapest powerbank, and should last a few hours per charge. BUT, this will end up beong more of a desk lamp or flashlight brightness. The authors origional project would easily light a large workbench, or small room.

    Early commercial led lightbulbs did this too. Took one apart to repair. It had 110 AC going directly into 2 series of 30 leds, wired in opposite directions. Considerably less wattage per led than Dipankar used, but bright enough to replace a 60 watt incandescent lightbulb.
    With the leds wired in opposite directions, no matter which side of the AC cycle was high, half the leds would light, driving them at around 4 volts (give or take). The resistance to reverse polarity of the other chain meant they did their proper diode function, and passed no current (stayed off, and did not blow up). Not the most effecient, or safe circuit, but it DOES work.

    if we want to put only 10 led what is the rating of the capacitor must be used??

    Thank you for such a great project,
    I am a beginner hobbyist in electronics and I have built this circuit with transformer - 12v 1amp, 1N4007 diodes, 470uf 60v cap, 1 Watt LEDs - 3 rows of 4 LEDs in series (total 12).
    Now as per your calculation you have put 12v 2amp transformer, 24 1w LED, as I didn't have 2amp transformer I used 1amp transformer with 12 1w LED.

    So my question is - will this create some problem with LEDs as I don't really know much about voltage & current calculations. I measured the Current consumption of 0.113 Amp.
    any suggestion will be of great help.

    1 reply

    4 years ago

    where are the heatsinks? those stars are mcpcb to 'mount' led on heataink. they're NOT heatsinks!!

    1 reply