You might want to check out glowinc.com. They have active forums etc concerning this st6uff and all sorts of tables, charts and info and they sell it of course. I bought some to do my daughters ceiling with a star pattern with their brightest green glow powder. It really is very bright and for about 20 bucks I did her whole ceiling with stars, galaxies etc. Once the lights go out it glows brightly for quite a few hours and is still barely visible as glowing in the morning. Gives the kiddos something to stare at while they are fading out.