[Kirstie]

Originally Posted by Finless

I guess you can't:-

The Aquatec LED Mini Light Stick
The Aquatec Mini LED Light Stick will replace the standard chemical light stick that is, unbelievably, still in use today. The LED Light Stick uses a high intensity LED along with a patented light diffusing acrylic material to give you an incredible glow that is very visible. These light sticks allow you to not only use on your person during a night dive, you can also use them to mark the anchor, entry points, etc.
The two different models (constant and flash) and four different colors allows you to be unique and stand out from other divers. Some groups have used these light sticks to color code their members. You can assign each member of your dive group with a different combination of models and colors.

I have a flashing one.