I have lights on every feeder.. I know from experience that pigs.. and deer will get used to white light on the feeders in a day or two, but I cover mine with green tape just because.. The feeder lights work without anything else, but are still a bit dark at times.
Just in case they don't come on... never know when one is on it's last leg.. I use a bow mounted light. I have owned dozens of the cheap Chinese lights with remote pig tail switches and they are ok unless you accidently tug on the wire once! I have owned lights from All predator as well and they are expensive and heavy.
Lately I have been using lights from fenix lighting. They sell a fairly small light.. or several models. Not only do they have a light, but choice of green, red, or blue lens covers, a mount for a picitinny rail, and a silent remote switch.... all for about $110 shipped.
I mount a picitinny rail to the bracket on my bigjim bow quiver and clip the light on it.. a little bit of electrical tape to hold the switch to the grip and I'm good to go.
The light can be adjusted from barely on to full go melt crap and within second can be removed from the bow, remove lens cover and used as a blood trail light or get out of the woods light.
For a long time, I thought the light would spook certain hogs and also certain deer as I would shine to see what was on the edge.. but I think more than anything, any critter coming in alone is a tuff task. Even if I would allow a lone pig to get comfortable eating, the slightest noise, movement or even light would send them in to convulsions and flying out of sight.. yes, pigs can fly! Yet, a group of pigs would often seem easy.
If you are the only critter in the feeder and a noise is made.. or shadows are slung around, you know it aint you! However if there is at least one other critter with you, you don't necessarily know that it wasn't them.
All of my feeder lights are green.. i've read that dark or black objects show up better under green light. I have used both green and red filters on my bow lights with no discernable difference to the pigs.
BigJim