I'd say get a LED drop-in for you 6P first, then think about other lights. The drop-ins start at $10 and go up to $55. For everyday use, I think
this drop-in would work fine. Output should be close to the L4.
Do you want lots of throw? Because the
Dereelight DBS should project 200 meter and also costs less the the L4 and is brighter too, which is a pretty floody light.
The L4 should be a bit more then 100 lumens, Surefire rates minimum out the front lumens so their ratings are usually lower then actual lumens.
The 6P actually project much more then the L4(500 Lux vs 4000 Lux), this is due to then narrower beam pattern of the 6P. But the L4 has more overall output then the 6P.
Now lets talk LED,
The newer LEDs, Cree XR-E P4-R2 bin, Seoul P4 U and the upcoming V bin, and the REbel 100 LED, all have at least double the efficicney of the Luxeon I(AKA 1 watt), III(3 watt), V(5 watt) and K2(varies from 4.8 to 7 something) seen in most store. So for the same power, the newer LEDs will produce twice or more output(Luxeon I, III, K2) or have half the Vf(Luxeon V, the newer LED will probably still have more output). The L4 uses the Luxeon V. It's a great light but it does get very hot within 15 minutes of on time.
Also look at the
Welcome Mat.
What would you like in your next light and at what price range?
You are at the point of no return, have fun with this new hobby!
Now over here, 100 lumens actually is not a huge figure, we have light smaller then a AA cell that produce that much light, Cue the
Draco. I think Modamag said 160 lumens. There are also cheaper lights that will easily hit that figure, like the
WF-400.
Like everyone said, the 6P is a great starting point.