Hey Dave! I'd like a single-output regulated 500+ lumen OTF neutral to cool drop in for my stock SureFire Z2 running on CR123a primaries (about 1.5 hour run time) or Tenergy LiFePO4 (450mAh) RCR123a rechargeable batteries (about 20 minutes run time). The Z2 will be paired with a handgun. What would you recommend? Thanks!
Hi
OK if I understand you you want a certain amount of lumens AND a certain amount of runtime. Runtime is simply how much amperage you are using and how much mah the batts this formula doesn't vary. A XPG S2 running at 1.7 amps will yeild about 370 or a bit more lumens OTF so if you are using 1500 mah CR123's you will get about an hour on high. Since it is amperage into mah there is really nothing a module builder can do to change that but cut amperage which of course cuts lumens.
Now a XML running at about the same amperage will yield about 100 lumens more ( a guess here since I have not measured this amperage) or about 450 lumens.
To get even close to the runtime you want it would have to be somewhere in this area as far as amperage goes and those two will give the best results. Now neutrals in either is no problem but of course the neutrals are slightly less lumens
Being on a handgun the XPG may be all you need but the XML will yield a bit more spill. Now of course I have XML's that are much brighter running at 2.8 amps or above but of course they come at the sacrifice of runtime.
I have many satisfied customers at the Tulsa PD and they are using XPG's in S2's and primaries but the XPG's will not yield quite 500 lumens.
You will have to decide on brightness to runtimes.
Dave