Why birds notice what you don't
The human eye stops seeing flicker around 50–90 Hz. Chickens keep responding past 100 Hz, so a PWM-dimmed lamp that looks perfectly steady to you is still strobing to the flock.
What flicker does to a flock
Perceived flicker raises stress hormones, increases feather pecking and cannibalism, depresses appetite and disrupts the melatonin cycles that drive growth and laying. The cost shows up as lower FCR and fewer eggs.
Flicker-free dimming
Non-PWM, constant-current dimming holds light output steady at every level from 0.1% to 100%, so there is no strobing to detect. This is the single most important dimming spec for livestock.
How to specify it
Ask for 'flicker-free, non-PWM' explicitly and confirm the dimming floor (0.1–0.5% is typical for poultry). Our poultry lighting uses 0.1% smooth dimming for this reason.