Exactly. If you put a camera on a tripod and leave the shutter open for hours, even an outdoor scene lit solely by starlight will look like a day scene, tho somewhat strangely bizarre, with no shadows.some of these pictures of lumes are also misleading. The wonderful photographers we have on this site give you great pics of everything to their finest detail. I also think, that they leave the shutter open longer when taking a pic, this usually leads to a lume which is brighter then expected.
It's a pretty cool effect, but shows you that lume photos don't prove anything.