[HairOfTheDog]

I think for the lights to work, they need to be bright, bright enough to fool the horse's brain that it's still daylight out. One light, particularly if they can go outside away from it, won't cut it. I knew show barns, and breeding barns, that did that... Left bright lights on till around 10 pm in spring to get them to cycle earlier.

[BladeRider]

I think for the lights to work, they need to be bright, bright enough to fool the horse's brain that it's still daylight out.

They have several florescent lights in their barn and tarps up at the openings. Thier padded horses don't go outside except to be ridden. Not a life I would choose for a horse.