Instructables
Picture of HomeMade Modern DIY Concrete Pendant Lamp

Designer lighting can be quite pricey. You can make yourself an entire set of stylish concrete pendant lights with a single bag of concrete mix and some old plastic bottles.
 
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Step 1: Supplies + Tools

Picture of Supplies + Tools
Quikrete 5000 Concrete Mix
Purchase at Home Depot
QUIKRETE® 5000 Concrete Mix is a commercial-grade blend of stone or gravel, sand and cement that's specially designed for strength. It is available at Home Depot and typically comes in 80lb. bags. The hardest part about working with it is moving the 80lb. bag. Mixing the small quantity needed for this project is easy – all you have to do is add water and stir thoroughly.

Electrical Stuff: Socket, Switch and Cord
Purchase Online at Grandbrass.com

Plastic Bottle
Reclaimed + Recycled
2-liter soda bottles and a thin water bottle work well.

Threaded Tube + Nuts
Purchase Online at Grandbrass.com
These threaded tubes are a common lamp part and can be purchased online or salvaged from an old lamp. I used a 3/8th inch diameter tube.

3 1/2" Deck Screw
I used a single deck screw to help hold the plastic bottles in place.

Box Cutter or Knife

RYOBI 18 Volt Cordless Drill with a 3/8th Diameter Standard Bit
For drilling holes in the caps.

Wire Cutters
To cut the cord and strip the wires for reconnecting the socket to the cord after putting the socket inside the lamp.

Step 2: Cut the soda bottle

Picture of Cut the soda bottle
Poke a hole in the soda bottle with a box cutter and use scissors to cut the bottom of the bottle.

Step 3: Drill a hole in the caps of the soda bottles

Picture of Drill a hole in the caps of the soda bottles
It's easier to drill a hole in the bottle caps when they are attached to the bottle. The hole should be just big enough to screw the metal tube through.

Step 4: Connect the bottle caps

Picture of Connect the bottle caps
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Screw the tube through both caps and use nuts on either side of each cap to hold them in place.

Step 5: Screw the bottles into the caps

Picture of Screw the bottles into the caps
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Screw bottles into the connected caps.

Step 6: Use deck screws to stabilize the bottles

Picture of Use deck screws to stabilize the bottles
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Step 7: Mix the concrete and fill the mold

Picture of Mix the concrete and fill the mold
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Use a large spoon to fill the mold. Shake and tap the mold after each spoonful to make sure the concrete settles.
iooner1 month ago
iooner1 month ago
jayeshshinai3 months ago
how effective would white cement be?
I'd like to know what the white material is as well. Thanks.
jgarton1 year ago
Just finished one! Looks great but.... It weighs a hefty 5.6 lbs
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How did you remove the inner bottle or did you just leave there? Is that safe? Looks nice though.
askestubbe1 year ago
How did you remove the inner bottle or did you just leave there? Is that safe? Looks nice though.
110_Design1 year ago
I decided to go further and make an industrial inspired plywood base. It is not quite finished (still needs wiring). I used a plastic bucket with a round plastic container to make the inside. Don't have a plan of where to use it, but thought it would be fun weekend project (more with the curing of the concrete).
Concrete-lamp.jpg
What is the white material with the glossy finish in the last picture?
godbacon1 year ago
Thermal mass to retain heat in the home.
jgarton1 year ago
Marbles would be a great idea too. Should be wide enough to let light through. Going to try that next!
rocketguy1 year ago
Broken glass is a great idea for an aggregate, but you'd need a lot of it to get light through, or chunks big enough to get stuck between the sides. Or pause your pour, and dump it in specific spots (but leaving enough empty to ensure strength at any particular level).

I used a glow-in-the-dark aggregate on my concrete floor (which is really stiff plastic, so as not to pop out) which could be really cool in conjunction with enough glass, but you'd probably need to stick it to the inside of the outer mold with 3M77 spray glue or something. Google AGT glow in the dark aggregate (I'm just a happy customer, no affiliation).
dezinger1 year ago
or substitute cork granules for gravel, and cork powder for sand
newflavour1 year ago
you could also make a 'hypertufa' mix instead of straight up concrete if weight was a concern.
Cool project.
Very nice too.
Of course I have doubts about weight !!
Why author doesn't answer ? All comments are nice !…
Cool project.
Very nice too.
Of course I have doubts about weight !!
Why author doesn't answer ? All comments are nice !…
danzo3211 year ago
What does this fixture weigh? Wire is holding it.. wire must be strong enough to take it.
danzo3211 year ago
Could add color to concrete, or by choice of aggregate, sand and cement, design the texture and color.
danzo3211 year ago
Not strictly necessary i guess. You're avoiding the molded-in rings in the 2-liter, for sleek design, and giving up some length of the fixture by using the screws which you don't want making holes in the surface.
danzo3211 year ago
Inner bottle must be greater in diam than lightbulb you have in mind. Incandescent will get the whole thing pretty hot.
adwait1 year ago
pretty cool... Would plaster of paris do the trick? or is it too brittle for this?
I work with plaster all the time and it is stronger than concrete in compression. How much abuse might the lamp take - kids waving hockey sticks could break either one.
eyebot1171 year ago
You should consider adding some broken glass to the cement. When it cures, it can be sanded to add colored light pass though.
You could use marbles and shattered auto glass. It's all "rock" to concrete mix. Marbles should be as big as the wall thickness to get them to light up. Really a different design effect than gray crete.
wow, really nice.
t8001 year ago
Very nice! ...and when I finish a project like this, that's the speed with which I would want to see how good they turned out! :-)
jongscx1 year ago
From experience, what has been the minimum thickness of concrete before it's not structurally sound anymore? I guess with just regular mix, not fiber-reinforced, etc...
adwait1 year ago
pretty cool... Would plaster of paris do the trick? or is it too brittle for this?
I had recently experimented some projects with POP and based on my learnings I can say that plaster of paris should work as well. I am going to try this.
Oh this is so cool, that sparks an Idea. Thanks for sharing.