1st Battalion 2nd Regiment Nassau-Usingen Light Infantry
This Battalion was involved in the defense of Hougoumont, The Grenadiers occupied the House, the rest of the battalion occupied the forrest, later during the French attack they were driven back to the garden, where they held their ground.
The light Jeager company was later send to reinforce the garrison of La Haye Sainte
The Jeager company inside La Haye Sainte recognizable by their light green uniforms with yellow belts.
In my opinion this site is the best source of uniform reference for the 100 days (Waterloo) campaign: