The alkaline battery powered LED light has a longer battery life, it will just get dimmer as the batteries wear down. The lipo battery powered light, VL200, will cut out on you when it reaches cut off voltage as lipo powered equipment does. The VL200 is definitely lighter if weight is an issue.
If you are thinking about a len aperture letting in light, then yes you are correct. But in the measurements of light from a set point then the measuring device had to use a smaller aperture to maintain the proper exposure, this means the light intensity was greater.
