I have both the UK 2AAA side by side pocket light and the UK 2AAA tube style light. I was testing them to compare the beam and discovered that the tube style seems to be a little brighter and whiter than the side by side. I switched around batteries and bezels between the two at different points of the test, and the tube always seemed to win. Is it possible that batteries that are end to end draw the power more efficiently than side by side setups?