I don't have a way to measure the lumens of my UF flashlight. However, the light I bought is the same as mentioned earlier in this thread reviewed here. This reviewer puts the output on high at 1523 lux, compared to the Fenix on Turbo at 3030 lux. As I said in my previous post, my Ultrafire is putting out about half the max output of the Fenix.
Fenix: turbo=3030 lux, high=1780 lux, medium=892 lux
UF: high=1523 lux

As I said before, the UF high mode is not quite as bright as the Fenix on high mode (107 lumens), but definitely brighter than the medium mode (53 lumens). From this I guessed the output to be around 90 lumens. Yes, the measurements I gave in my previous post were by my naked eye, but it looks like I was pretty close. The information from light-reviews.com confirms what I perceived.

In spite of it being only half as bright as the Fenix, and in spite of the battery fit issues, it's a good buy at $21. It's not the [cheap] replacement I hoped it would be, however.