keep the luna pro get rid of the spot attachments, and use the lunapro for low light work
just learn to judge the light by experience ... most of the time you don't even need a light meter
too much fussing around when you could already be done with the photograph

http://www.fredparker.com/ultexp1.htm

there's endless threads about sunny 11 / 16
they are some of the most useful threads on apug ...