The Inova T1 is a decent recommendation. The tint on mine is a little too warm (green) for me, but the beam is very floody like the LuxV emitter of the L4.
Even better, IMO, is the
AmiLite Neo T5. Better output, and nearly as much runtime as the L4, but on a single CR123A instead of two. Considering how much improvement we've seen in the flashlight market over the past year, I'm amazed at how well the AmiLite continues to hold up.
If you like the L4, and you're using it for close up work, I wouldn't recommend the NiteCore (or any other Cree-based light) unless it has a diffuser.
If you were happy with the L4 and want to stick with Surefire (no reason not too), the obvious suggestion to me is the
E2D LED (basically, an L4 with a newer, 2-stage head) , or the the
E2L if you want longer runtime at the expense of maximum output. If you're OK with less output and a shorter light (one cell instead of two), the
E1L or
E1B would probably work as well. With any of these newer E-series Surefires, I'd recommend an
F04 beam shaper to smooth out the beam - use it for close-up work and remove it when you want more throw.