Welcome @richapple !!!
To expand on what wayneluke said: you can turn the ir lights off and keep the night vision on, this will still use any ambient light available - from the live stream screen in the app, click on the “gear” icon in the upper right, then click on “advanced settings”, then toggle off “night vision IR lights”
Here is a thread dealing with external IR sources, it looks like users have been getting good results:
This sounds like the best for your scenario of catching wildlife - and please share any fun footage you get of bears or their friends 