I have often seen inconsistent weights for gear. Battery weights and scales also vary.
The Zenix IQ is one of my favorite headlamps--a good review is at
http://www.flashlightreviews.com/reviews/blackdiamond_zenix-iq.htm.
(More headlamp reviews are at:
http://www.flashlightreviews.com/reviews_index/reviews_index_headlamps.htm.)
The Zenix IQ has 6 intensity levels (the lower 3 are very similar to my Princeton Tech Aurora). It also contains a regulator in addition to multiple intensity settings. The regulator keeps the light output constant over a range of battery voltages--thus the output is the same for new and partially discharged alkalines as well as NiMH rechargables and lithiums.
.......................................... mA .................. mw ............... battery
PTec Aurora ............. 40/100/220 . 180/450/990 ...... 3x AAA alk
BD Zenix IQ, high .. 120/230/480 . 360/690/1440 .... 2x AA alk
BD Zenix IQ, low ...... 30/ 50/ 90 ...... 90/150/ 270 ..... 2x AA alk
BD Zenix IQ, high .. 140/300/680 . 350/750/1700 .... 2x AA NiMH
BD Zenix IQ, low ...... 30/ 50/110 ..... 75/125/ 275 ..... 2x AA NiMH
(My measurements.)
Current and wattage should be very similar for lithiums and new alkalines.
Doug