Oh, BTW, although the total output of the 2 lights are similar (100 lumens), the beam characteristics aren't identical. The L4 has a floody beam while the U2's beam throws further. Also, the L4 is a single stage light (100 lumens and off) while the U2 has multiple stages of brightness. To get more info on these two, you can also visit flashlightreviews.com, a WEALTH of information.