Just to share with you all- I just got a set of three LED flashlights from Home Depot ($9.99 in TN). They are perfect for candling- small and compact and just the right size for the end of the egg. The ones at my HD were orange, green and glow-in-the-dark in each package and it comes with batteries for all three. Worked like a charm last night! The LED bulbs generate no heat so you don't have to worry about frying the embryo. (I have no ties to Home Depot other than I seem to be in there all the time. I just saw these and thought you all might want to check them out.) Let me just say that candling is about the coolest thing I have ever done. My eggs are only on day 5 so I was early (but I wanted to check the flashlights). I have veins everywhere. IT IS SO COOL!!!!