N13708

The 3,200-hour private pilot of a single-engine tail-wheel-equipped experimental airplane was landing on a rough and uneven 2,900-foot by 50-foot wide grass runway at a private airstrip. The pilot reported that his vision became impaired by the glare of the sun during the touchdown sequence. The left main lading gear collapsed after it impacted a rock, resulting in structural damage to the airplane. No mechanical anomalies were reported with the engine or the flight controls. The pilot reported the wind was light and variable at the time of the accident. The pilot further reported that landing the airplane in the opposite direction (away from the sun) would have been an option.