The current draw was check with two DMM's a Fluke and a cheapie they both are with in 0.01 of each other, i do not believe in changing DMM leads to give fase high readings (just my opinion).
The trustfire C8 has a 2 amp driver in it the same as the KD C8 and ive just swaped the driver in the Trustfire C8 to another 2 amp driver and im getting 1.97 amp,s at the tail cap every thing else test out on par.
The drop-ins and the C8 (before driver change) are putting out around 500 OTF lumens there is not 3 + amps hiding in there drivers, they are under driven and if you check early pictures of the P60 drop-ins the drivers have changed.
Im still buying more of these drop-ins as they have a nice tint and only 3 modes (H,M,L) 1.5 amps is enough there is not much more throw if you double the amps just a brighter hot spot IMO and the drop-ins get way to bloody hot running 3 amps or more as at 1.5 amps they get hot enough.
The drivers have to be faulty and going into direct drive to get more then 3 amps IMO from 3 amps to 5 amps an XM-L does not make much more light at all it just makes a lot more heat.