What are the dimensions of the DLG's light tubes?

The Down Low Glow light tubes are 12.5" long.

The DLG tubes are 1" in diameter for the wider tubes (used in our Single tube DLG systems) and 3/4 " for the narrower tubes. One of each width comes with our Dual Tube Systems. The narrow tube is designed to fit under the chainstay of a diamond frame bike. If you want two of the 1" tubes (for simplicity, looks, and ease of mounting on irregular frames), then purchase a recumbent mod kit, available in our DLG accessories section of the store.