That’s the question [Kathy] asked when she built this LED matrix light pen project. It looks simple enough – a 64-LED matrix illuminates as the pen draws shapes.

In today’s fast-paced world, where versatility and practicality are paramount, the MCG Tactical Phoenix Tactical Pen Light ...

The LED Moonlight pen works like a pen, but has a light on the tip so you can read what you write, even in movie theatres, back alleys, and inside a patient’s abdomen.

Send messages across the room with this LED pen, which gives you 118 characters to make your point. Its brightness is controllable, and you can speed up its scrolling or slow it down for those ...

LED Pen Lights Streamlight’s FiberWrap fiberglass polymer pen lights come in four high-intensity LED colors. The red, green, white and blue PolyStylus pen lights feature a 5-mm LED designed for ...

LED Pen Light. $20 at Amazon. This handy pen light fits right into any pocket for easy and instant access. It packs a punch, too—producing 220 lumens for seven full hours.

Best Affordable Teeth Whitening Pen + LED Light Kit. SmileDirectClub SmileDirectClub Teeth Whitening Kit with LED Light. Now 12% Off. $34 $30 at Amazon. Pros. Cons. Requires LED light; ...