My first "proper" led light, a P1D CE, in olive colour, I now have the Q5 version in black as well.
Firstly the smooth reflector is crap, the Q5 has the smooth reflector, and seriously you cannot tell the difference at night, so I'm going to swap the led's over.
The dimpled reflector is the one to go for.
I use AW RCR123, these fit perfectly, I have found some el cheapo brand do not, or rather I won't risk it, they have a steel link under the insulation that gets ever closer to being exposed when the battery is inserted/withdrawn, and I don't want to risk a meltdown.
Performance wise excellent, cost wise expensive, especially now.
I recieved today my latest light a CREE/MX POWER with WCP4 led, and it is 95% as bright as the P1D, despite costing around $10
I have just this minute been out in the garden to try a few, the MX power has a tighter spot and better throw than the P1, but still very floody, certainly good enough.
I also tested another cheapo under $10 that I modded with a Q5, but although bright it's not as good as the MX power one.
Hope this is of some use to you, but if I were buying again, I would buy 2 MX Power for the price of 1 P1D, and still have money left over.
The P1D is better built however, but the others are in no way bad.
I do like the claw grip of the P1D though.
all the above are tail standies
tabetha