Get the LED out: The Invisible Costume.

Step 2 What you need.

You are going to set up a bank of UV LEDs in the brim of a baseball cap (or other hat of your choice) to shine on your face at the press of a button.

You will need:

• A hat with a brim. I'm using a baseball cap, but you may prefer another style of brimmed hat.
• UV LEDs. I'm using ten I purchased from fellow-Instructabler Phenoptix .
• Wire
• Aluminium foil
• Card (cereal packet is fine)
• Glue stick
• Black electrician's insulation tape.
• A normally-open push-switch (I used one I had in my bits box. I think it came from a VCR control panel).
• Battery clip
• Double AA battery-holder.
• Optional - resistor. Many Instructablers swear by putting a protective resistor in series with an LED. These LEDs won't be switched on very much, and only have a 3V supply anyway.
• UV security pen (the kind of thing used to mark your electronic goodies in the hope that the police can trace them after they've been stolen. You can also buy "secret message" pens in stationary stores that use UV-visible ink as well).
• Something to remove the security pen!

Comments

[Lynne Bruning]

Highlighter pens also work - not so invisible, but an option to further the design approach.