Birds and Full Spectrum Lighting
Attn. Mitch Rezman
Fluorescent lights.
The recent post here on Vit. D led me to more research. It appears most if not all of the Windy City Full Spectrum lights have simple magnetic ballasts, producing visible flicker.
This is proven for chickens and assumed for the likely better eyes of psitticines with their mainly flying lifestyle. High frequency electronic ballasts are now standard for indoor fluorescents where human health is a consideration as the high frequency flicker is far faster than our visual system can perceive.