We have placed our UVC LIGHT in the bottom portion of the bottle.
1) The light is constantly in contact with your water.
2) Because the light is in the base, this gives us more possibilities for lid accessories (straws caps, etc)
3) The charging occurs on the bottom.
4) The charging port has an attached waterproof seal to make the bottle completely water resistant.
5) The cap has a removable strap which makes it easier to carry.
6) The Luma Bottle holds more water (22 fluid ounces).
7) You can't beat the price!