The flag of Luxembourg consists of three horizontal stripes of equal width. The colors and their respective hex color codes are:

1. Top stripe: Red (#ED2939)
2. Middle stripe: White (#FFFFFF)
3. Bottom stripe: Light blue (#00A1DE)

The flag has an aspect ratio of 1:2, meaning its width is twice its height. As for geometric properties and measurements, the flag can be scaled to any size while maintaining the aspect ratio and equal-width stripes. There is no specific emblem or symbol on the flag.