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The 6P is an excellent choice. Despite that fact, there are several lights that can compete with it on the same playing field.
Streamlight is a well-respected competitor to Surefire. I can definitely recommend their
2nd Generation TL-2 model. (There's an LED and Xenon version of it). The xenon version puts out more lumens than the 6P. It also comes with a removeable carry-clip.
I work nights, there's two lights that I rotate as my main EDC; a Surefire L4 and the LED version of Streamlight's TL-2. Can't give it a higher recommendation than that.
Still, not every Streamlight model is a winner. Just my honest opinion. But more of their models are hits, rather than misses.
One light you're likely to hear a great deal of praise about is the
Night-ops Gladius. I had a chance to examine this LED light. It does have its virtues. The main problem is, I've heard owners say that the only way to carry the light on your person is to lock out the tailcap. (Otherwise the light has a tendency to turn itself on or the cap rotates to a different mode). For me, when I need to use my light, being able to reach down and instantly hit the tailcap button is a big plus. One that I'm not willing to give up. The tailcap itself is another issue. Designed from cheap-feeling plastic, it allows the light to function even if the tailcap gets damaged. But other companies take a different approach. They over-build their tailcap switch to resist damage.
I don't hate the light, but neither do I think it's the best one out there.
Inova is another company to check out. They tend to be generous when it comes to their lumens numbers, but they still make some good lights. The
T4 model is a great rechargeable light that uses LEDs. Their
T3 model is the non-rechargeable version that uses a tailcap clickie. If you'd prefer a momentary tailcap switch instead, there's the
X03 model. (Same light but without checkering on the barrel). Those particular models toss out a narrow, concentrated beam. Other Inovas put out wider beams. Also, an Inova light is as tough as a U.S. Marine! If you want durable, check out Inova.
Hope this helped.