Rotating High-pressure Sodium Lamps (image) American Society for Horticultural Science Caption Rotating lamps at Wenke Greenhouses in Kalamazoo, Mich., induce early flowering of bedding plants. Credit Photo by Ron Godden. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.