Interesting concept.

My feeling is that it might work for a short time only. Deer are very smart and can easily spot a fake. Scent is a strong component in their arsenal and without a scent to go with the eyes...

The only thing that was really effective was my wonderful Border Collie. They had a deal that they did not come into the garden from the woods and he would never chase them unless they did. If they were in the woods or the pasture he would just look at them as part of the landscape.

I have had to resort to stinky stuff like Wolf and Coyote urine. They got wise to that. Bobbex works very well but what a pain in a large garden. Liquid Fence is reported to be very effective and will supposedly last longer. I hope it works because I could go broke trying to keep deer out.

Fencing is not a viable option for me but perhaps it would be for you.

We once used a fake owl to try and keep pigeons out of a barn under renovations and it worked for about a day and a half before they came in and pooped all over it. Critters are not easily fooled!

Haha - reminded of my 'potato hawk' suspended over the cabbages - as much use as a chocolate teapot.

But yep, it was a massive shock to this urban townie to discover the rapacious damage wrought by solitary muntjac. I have low expectations of maintaining a decorative garden in the woods - thankfully, I have an urban allotment which only has to cope with the evil pigeons - if all-round fencing is not an option, then maybe sequester a smaller area which is fenced and kept as a deer-free garden while the rest of it is a grand, ongoing experiment in inter-species co-habitation

Let me just say that motion detector lights in my back yard have absolutely no effect on the deer. And I have a male dog who regularly patrols the area so I also doubt the effectiveness of predator urine :-) I resort to spraying the most vulnerable plants with a repellent and caging any edibles.

Just noticed this week that a gorgeous, big new heuchera I planted last fall very close to my entry (and directly under said motion detector) and that made it through winter untouched, has now been pruned back to nubs of new growth. Sigh..........you just can't win with deer.

I have copied and pasted what I posted in the Hosta forum. I am using the gadget you are asking about and many,many other things. If you are gardening and have deer and other wildlife it is going to be a lot of heart broken lost and lots of work to grow anything. Good Luck.

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Everyone
told me you have to train them not to come to your yard for food. Once
they do not like what you have they do not come as often. My property
was vacant for a few years and there is a orchard so they knew food was here and they
were free to roam.

Start spraying early....as soon as anything peaks out of the ground.
Spray every week. It really is not expensive if you make your own
mixture.

I purchased...
Wolf urine that I put in a spray bottle and Spray that occasionally on
grocery store plastic bags and hung them on the fence where I see they
may have been by the poop evidence.

I put some of the Sweeney's Deer Repellent gadgets. They are covered
containers that you put on a stem. That is suppose to trigger flight
response to the deer. I suspect it is a wolf urine concoction. Home
Depot purchase.

Homemade spray. Onion, Garlic, hot sauce, wolf urine, egg, mixture. (if
you want my recipe I will post) I am on 4 acres and this mixture does
not cost more than $10 for a season.

Biondi Deer off work for my deer. I tried every one on the market. Every
area deer are different. I do think you have to try them all to see
which one your deer do not like.

Nite Guard system. Home Depot. It is a flashing red solar light to fool the deer
that they think danger. Of course near that area I spray the wolf urine.
So it is a site and smell fix I am using. Move them around every month. They know a wolf would not stand in the same spot blinking for days.

I have herds of deer not an occasional walk through deer problem. When I
see deer it is 10 or more. I have had as many as 20-50 deer in the
front yard at one time.

I have also sprinkle Millorganite 3 times a year.

Finally, there path I have picked up pallets from the grocery store for
free. They have trouble walking on these because their feet go through
the slat space and fall down. I have watched them limp away after
falling down when they step out of the woods heading for a meal in my
yard.

As you can see I have done everything short of a gun. So far for 5 yrs
of growing seasons only one hosta has been eaten I have 100s. So I am
not sure if that was deer, rabbit, groundhog, etc. since it was only one
hosta.

Oh and by the way the little blink will not keep anyone up. The little blinking red light is small it is suppose to simulate a wolf or predator blinking. If the animals blinking in your garden as they eat it to the ground does not wake you up these will not wake you up.