Glass Cement Lamp

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About: I am IT professional, living in Bangalore, India. As new gadgets come out everyday, we indulge in spending significant time and money on these gadgets. And our kids are learning from us, they know how to use...

Hi All,

In this instructable, I will share how to recycle milk bottle into a beautiful lamp.

This project does not need any power tools, so anyone should be able to replicate.

Step 1: What Do We Need ?

  • Milk bottle ( I used from Drunken Monkey, India)
  • PVC Pipe based on outer radius of the bottle(2.25")
  • PVC pipe based on bottles neck (1.5")
  • White cement
  • Copper LED string light (2 mtrs)
  • 1w 100 Ohms resister (2 no)
  • White foam sheet 1 mm thick
  • Thin Acrylic sheet
  • Hot Glue gun
  • PVA glue or Fevicol
  • 3" Long screw
  • Soldering iron

Step 2: Mould

We want to place the bottle inverted on a cement base..

  • The inner diameter of 2.25" PVC pipe = outer diameter of the bottle
  • Outer Diameter of 1.5" PVC pipe ~= outer diameter of the neck
  • Cut 1.25" of 1.5" PVC pipe and
  • Hotglue this on a 3"x3" acrylic sheet
  • Add a small piece of acrylic sheet to close the pipe, This is where all electronic will be housed
  • Now hotglue the 2.25" pvc pipe as shown
  • Let the hot glue cool down

Tips :

  • Donot use cardboard for mould, as it losses it's shape and position with wet cement

Step 3: Cast

  • In a bowl make a medium thick paste of Cement + water ( 2:1 ratio )
  • Pour gentling into the mould
  • Leave the mold for 30 minutes
  • Insert a long screw into the mold as shown, this will be used for inserting wire later
  • Remove the nail after 1 or 2 hours and make a small grove as shown
  • Let the cement dry overnight

Tips :

  • Vibrate / shake the mould to remove big air bubbles
  • Do not over do, as smaller air bubbles gives nice texture to the base
  • Cement takes time to dry, do not get impatient

Step 4: Demould

  • To demould, we could cut the pvc pipe with a hand saw or dremel, but that without leave cut marks on the cement base
  • To avoid this, I used a soldering iron to melt the pvc pipe, in a straight line
  • For Inner pvc pipe, I had to make 4 cuts using soldering iron
  • Remove all pvc pipe and acrylic sheet
  • Test if the bottle fits in the base, I had to sand the cement base a bit for the bottle to fit
  • Sand the base where needed

Step 5: Electric Connection

  • I have used 2 mtrs on LED copper wire string, connected to a USB 5v adaptor
  • I have added a 2 - 100 ohms resister in parallel for protection
  • Test all connection
  • Fix the bottle on the base with hotglue

Once all is done, place the lamp at the corner, plug it in and admire

Tips :

  • Use electric tape on joints and secure it via hotglue
  • Add a white foam sheet below the cement base to avoid scratches
  • Used voltage drop across the LEDs to prevent heating and buring
  • The lamp should not get hot due to LEDs

Please share your comments, suggestions and recommendation

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