I have been hatching duck, goose and now, chicken eggs for about a year using a Little Giant incubator. And I have used different types of lights to candle the eggs. Most have had limitations. Sooo, I bought a electric candler and was having so much fun seeing the eggs develop - then the thing broke. I have no idea what is going on in the eggs that are now in the bator unless they start making noise and hatching. Back to square one trying to figure out what to get to use as a candler. I know some people use the mag lites. What kind of mag lite do you use - brand, size, etc. If I invest in one of those, I would like to know if it will stand up to the use and the battery thing is doable. If the batteries have a reasonable life span and/or can be recharged.