I'm not sure if anyone has seen these but I haven't seen anything posted about them.
www.glowdoggie.com
I ordered a pink and blue for the kids. Our house is on 1 1/2 (fenced) acres and I spend many nights out with the spotlight so I'm assured I know exactly where the kids are in the yard. I love these, makes it so easy to know exaclty where the kids are in the yard without blinding my neighbors with my spotlight.
( Although, I still keep the spotlight with us, to watch for "other, night time" critters)
I slowly introduced them to these collars by putting them on while we were in the house (with lowered lights) and giving treats for them being so good with them. We ventured out last night and it is amazing how well I can tell exactly where the kids are without the spotlight I usually use.
Just thought I would share in case anyone else hovers like I do when we're out at night.