Have you trained with night sights?
Before shelling out money for tritiums, try shooting in different light levels first. Borrow a gun with night sights to compare if you can.
I discovered after actually shooting in low light and dark conditions that I can shoot better with my Para Ordnance with plain sights than I can with my Kimber with Tritiums.
You can't shoot what you can't see. A good light is preferable to night sights any day. (Cheaper too) Then make your decision.
I'm not trying to talk you out of them, just decide if you really need them.