We used those resistors in what we thought was the best brightness/time ration that the customer would want; with a fixed power source (batteries) raiseing brightness would always lower operating time
We are looking into changing the resistors to increase the brightness, and would gladly install them on any order that a customer desires
The TriLight/Helios/etc series have a massive heatsink which does couple quite a lot of heat to the case; even so - I have only felt the case get a little warmer on the most powerful of our products - the MEGA6
Any type of batteries/combination can be used on the products, as long as they don't exceed the following currents
TriLight:1.1A
TriLight-III:3A
Helios:2.1A
Super6:2.1A
Super6-III:6A
Mega6:4.5A
Please note - the Super6/Mega6 series have a beam of FLOOD and not usefull for any distances; we have had customers buy these products just for their high light output and return them since they didn't understand the definition of "FLOOD"
If you plan to use the smaller AA/Packs, make sure the ESR of the battery is able to sustain the large current demands
When properly installed, the lenses should make correct contact with the glass lens - and keep them in alignment for a correct beam; a plastic lens might "flex" a little from the pressure of the lenses and cause the beam to distort; we really suggest use of the UCL lens (
www.flashlightlens.com) since it adds another 8-9% more light than the "cheap" plastic lens that comes from the factory
I hope that answers your questions