That's what we use... and I still had trouble. Maybe it's because of the eggs being super thick?
Our bathroom linen closet area is where we would do it, after turning the lights off. My daughter and I would do it with her dad, since he's the only one who could hold the eggs right with the light to get it to shine through properly.
I can't figure out how to do it.
I admit it. I'm a flash-light failure.
I was thinking of investing in one of those flash lights designed for candling eggs, to see if it helped me.