I had always thought that "good lume" meant it was bright and long lasting, and that a better lume would be both brighter and of longer duration. But then, following a link from another WUS thread I found this page showing a variety of luminescent tape:
I call to your attention how the brightest options are not the longest lasting, and the ones with the greatest duration are not the brightest. So this makes me wonder, is there a tradeoff? And if so, what is most desirable for a watch...initial brightness or long lasting lume? Please 'enlighten' me.