Using a filter on a spotlight be it red or amber is is not the most important aspect of choosing a spotlight. Color makes no difference. The intensity or the amount of light being put on the animal red or amber is whats important. The origanal spotlight being used "before" being filtered is what matters. When you place a filter on a light, thats exactly what you do "filter"/"decrease" the amount of light being let through the lens. The reason night hunters are more successful with a filter on their light be it red, green, purple, amber, or even blue is because they have reduced the amount of light initially being put on the animal. There are many different colors of filters you can utilize, however the origanal brightness of the light in question is much more important than the color of the filter. In other words, take 2 spotlights. One light is twice as bright as the other. Then "filter" both lights with the same filter. The brighter of the two lights will still be twice as bright as the other, thus making a more intense beam than the other. The brighter of the two lights, even with the same filter will be initially harder on an animal, therfore on averege will call less animals in close. Everything is relative to the origanal light being used. As a matter of fact, using a dimm white light can often be more effective than using a filter, if used properly. We actually hunt exclusively with a dimm white light and kill predators under 20 to 30 yards all the time. Every situation/animal is different, dont get hung up on a color. Pay more attention to the intensity or brightness of the light cause ultimately the animal will let you know if it is too bright. Try letting your hunting partner shine your spotlight in your eyes at 50yards or so using several different filter to see which one is the easiest to look into. Which ever color that may be, is the setup you want to use in the feild! More hunters on average use the red filter on their spotlight because they have been successful killing predators with the red, so if it works, dont fix it! If you have animals hang up when you initially hit them with the light, there is a good chance that your light is too bright, or that animal had a bad experience with a light before. If this continues to happen, odds are you need to back off on your candlepower or lumens a little until the light doesnt bother the animal.