Here is what I use and it works good. It is a shop light with an 65 watt halogen bulb. I lined the inside of the cardboard with aluminum foil with foil tape.
WOOOO HOOOO!!!! Hey this Ovascope Rocks!! So ya put in the egg and you can just look at it with naked eye. Put egg in holder and there ya go...and the light is strong, whole egg glows. Now once egg is in place you can rotate egg with a dial so ya don't have to over handle the egg. Now the way cool part. Ever check an egg and not TOTALLY sure.... put cover over egg.. all outside light is GONE, Image is magnified and WOW. You can also hook up a web cam to the adapter to take stills or video of your eggs. I am So happy with this purchase... we have a swap saturday.. i may bring it for others to eval 4 themselves.
does this ovascope come with a light already, or do you have to order a ovaview, cuz i just ordered an ovascope from enasco too and it's comin in but i'm not exactly sure if it comes with light or not?