Light Charging Tritium Lume?

[HogwldFLTR]

I replaced the dial on my 1803 a while ago due to a scratch through the applied crown and noticed that although the old one would still faintly glow in the dark, the replacement dial was always dark. I assumed this was due to the age of the tritium in the markers. The hands still maintain a faint glow as they weren't replaced or were Luminova replacement hands. The other night while walking the dogs I held the flash light to the face of the watch and low and behold I was rewarded with brightly glowing hands and markers. Looking around the web I was able to find at least one citation that said Tritium charged paint will glow in the dark if charged by light. Any one else experience this? Sorry, no photo of the glow results.