After looking at the Cool-lite and then at a few other candlers on amazon i dont see why I couldnt make a plastic ring (I'm envisioning electrical tape over something rigid) that would fit over the end of my super bright 2AA LED maglight. It would essentially do the same thing and is probably brighter than those other lights.
I should have done a little more research before being a pest asking....
We tried at first just cupping our hand around an LED flashlight, and it works, but it was kind of clumsy and I worried about hitting the egg on the lens. We purchased this one last year: http://www.amazon.com/Magicfly-Bright-Light-Candler-Tester/dp/B00KCKNYCY/ref=sr_1_2?ie=UTF8&qid=1455684834&sr=8-2&keywords=chicken+candler
I really like it. The rubber egg holds the egg and I can move it so much easier with out trying to make a goofy cupping with my hand. For me it just worked better and I really do like it.