I recently bought some Super Luminova from Frei&Borel for 32 bucks plus shipping. Anybody here know what the difference is between the Super Luminova you buy from Frei&Borel and the Strontium Aluminate you buy on e-bay for 7.99 per oz.? I have read that it is all Strontium Aluminate and has a glow time of 12 to 14 hours in green. If there is not a difference I would say that Frei&Borel is making a heck of a profit.
There is more in these photoluminescent paints than just strontium aluminate. They also have to have various rare earth phosphors added to them to act as "exciters" or they will not glow. These exciters are expensive elements like europium, samarium, etc.
As more and more of these types of paints appear, each company producing them will get a patent on its own particular proprietary blend of added exciter materials. These will make a difference in how much and how long each paint can glow and the color it will glow in. For example, one paint may not glow as long as another, but will do so more brightly.
I have been told that the "LumiBrite" used by Seiko is currently the industry leader with "Super LumiNova" in second place.
Ideally, one wants one's paint to glow brightly for at least 12 hours and to do so after only a few minutes of exposure to bright room lighting.