My SO has like 3 streamlights, I think one is a strion, but has switched to the surefires for some reason... from which he has now like 3... Streamlights are pretty good lights but I think the primary reason for change was for robustness and clarity/evenness in beam quality at a distance... but I don't remember...which really doesn't matter when we are putting them up to eggs. LOL
Sometimes the lumen thing can be misleading from company to company depending on if they measure max lumens or run time lumens. Even the color of light and quality/style of reflector can make a difference too. I've been told that for lumen comparisons, you kind of have to go by within companies. I haven't used a streamlight for candling but I am sure they would do just as well as a surefire with a 110 lumen output.
I'm not sure what the lumens are for the LED I have is.... but to me it looks brighter than the stock bulb. I do use rechargeable batteries and have the flashlight in a little baggie so I can make sure the light is concentrated onto the egg when candling.
EDIT: On the lithiums... You're going to wear that out in a few weeks if you use the light like I do. I'd go get those rechargeables asap.