not a bad idea, BUT:

1.) in many countries, Tritium sights are not allowed due to #2:
2.) radio active radiation is send out as long as the Tritium is not encapsult - it´s Your own health You will offend
3.) Each 8 years Your tritium decreasesit´s lighting strength on 50%
4.) The LED-powered sight is much stronger in light output, so You could use it not only in the very dark, but also in dusk or dawn well, or say it like this 24 h a day...