I am familiar with tritium as my Beretta 92 has these. This is what I'm talking about, "The high definition 3-dot sight system is coated in Superluminova®, a special photosensitive material. Short exposure to any kind of light, is enough to ensure long lasting luminescence of up to 30 minutes. Rear and front sights can be removed for replacement with other types of sights."
My bad, it was 30 min instead of an hour. At least one new handgun on the market is installing these standard. It was my thinking that the M&P came with these.