You will need
- A piece of cardboard folded into a rectangular tube
- Small bits of aluminum foil
First, fold the cardboard so that it makes
a four-sided box with open ends.
Make a hole in one of big sides for the bulb.
The bulb should fit very snugly.
Glue aluminum foil over the hole, covering it.
Stick aluminum foil on the inner surface
of the other big side.
Tape the short ends of the box together.
Poke the bulb through the hole, piercing the foil cover.
The upper layer of foil touches the bulb casing and
the lower layer of foil touches the bottom of the bulb.
Note: To connect the bulb holder in the circuit, have one
wire touching the upper foil layer and another wire
touching the lower foil layer. Tape down the wire ends
to the respective foil layers to secure.