I designed this project to be an alternative. These "lights" don't use any source of power, and as long as they get some bright light during they day you'll get at least an hour of glow from them after dark. You can make the "bulbs" any shape and size, and design the length of the strand for the application. They require some effort up front, but can be blissfully ignored once installed.
The science involved here is the use of phosphorescent materials. Phosphors absorb light and slowly release it, creating the glowing effect. Technically, your bulbs will glow all of the time, but during the day it isn't very visible (they just look like pastel bits of plastic) and at night the glow starts out bright, but fades over time. More colors are becoming available all the time - I've used six different colors for my bulbs, instead of just the traditional green glow in the dark. I have found at least 11 different colors online, so you really do have a great number of options.
I did a bit of testing, and found that sunlight was the best for creating bright lights, but florescent and incandescent lights did a surprisingly good job of recharging the glow, too.
Step 1: Supplies and Equipment
-resin - this is Envirotext Light, an epoxy type resin is best for this project (I only used a tiny bit, you can buy a smaller package)
-phosphorescent/glow powders - available all over the internet, this site has a wide range
-string - nylon is my first choice for outdoor use, pretty much anything will hold up indoors
-drill, dremel, or other method of making holes in plastic - I used a 1/16th inch drill bit
-waxed paper or other surface protector
-dust mask - keep the powder out of your lungs
-safely glasses - keep flying bits of plastic out of your eyes
-gloves - disposable plastic for resin, leather for drilling your pieces
-mixing cups and stirring devices for your type of resin - I used waxed cups with volume markings and popsicle sticks, that won't work for all resins, check the instructions in your package