I have a couple of these:
http://www.foxlights.com/foxlights-instructions.html They do work, the lights run in random pattern, there is a blue light as well in the mix and a strobe effect. From a distance it looks like someone walking around with a torch.
I move them every couple of days though to the top of another fencepost or location. This seems to heighten the effect.
You could combine them with a radio, set to the overnight BBC World service. Talk Radio seems to scare 'em more than country music.
Haven't tried death metal though I must admit....
Peeing helps, but in a late cold spring when predators are hungry it isn't enough. You need a whole battery of deterants if you want to get serious, and where I live they are the price of doing business.
Be tidy, clear up any bodies or smelly foods straight away, smells attract pests. Electric fencing can be very effective, but remember the enemy needs a foot on the ground to complete the circuit and get a shock. Birds can perch on an electric fence with impunity, and foxes and coyotes will jump and climb.
Sadly it seems that if you are a chicken or a newborn lamb everyone wants a piece of you.
The only thing that really works, and is the reason why I am still in the sheep business, is an LGD, livestock guardian dog, that lives with the animals 24/7, in my case a 120 lb Akbash.
This brings a whole new set of problems of its own. You just went nuclear! Whether it would be worth it for a few backyard chooks is highly debatable.