In my experience, hunting in heavy cover, I lose sight of regular fiber optic pins when there is still 15 or 20 minutes of legal time left, especially when trying to sight through a peep. I have used the Truglo which offers the advantage of bright fiber in good light, and tritium glo in lo light. I like it very much. I have also used the tritium pins that are for old fashioned pin sights. They are not as visible during normal light, but are very visible in low light. Neither is bright enough to ruin your night vision. Its just a dull glo a little brighter than the numbers on your watch.
I have since upgraded to a Holosight which is even better.