check your 'bright', apparently it can wear out and fade. so you can either take a photo with a flash or go out in the dark with a torch. think ours is still ok.
and here is what we did today, its a hard life being a pony....
the mares sheltering behind the hedge last night, I have taken pity on Abbey and given her a raincoat to wear, wee Esme is not looking too impressed...