Colour correcting glasses. Under HPS lights everything looks yellow. These will make it seem like clear daylight. Not only will these glasses protect your eyes but it makes it easy to check the maturity and health of your plants. Insects infestations will stand out and are easy to identify. These glasses provide benefits that clearly exceed the performance of all competitors. The nylon lenses are manufactured for Method Seven by Carl Zeiss using Method Seven's unique lens technology and provide exceptional color balancing due to lenses formulated to exactly offset the physiologically stressful, intense yellow spike of commercial HPS lighting fixtures. They provide exceptional clarity due to the high optical standards obtained by Carl Zeiss. Available either uncoated or silver coated (combining your indoor grow and outdoor lifestyle), 100% UV protection, and great value.