The HI VIZ Litewave H3(TM) Tritium/Litepipe S&W M&P sight set has combined Tritium with their empowering Litepipe technology to provide 24 hour illumination. Providing seemless sight acqusiition and crystal clear sight picure day or night, makes this combo a bullseye everytime! New! LiteWave H3A(R) sight combines Tritium with the HIVIZ Litepipe technology for 24 illumination. Now you can have the advantage of day and night performance all in one sight system.