I agree, a good pocket knife is a great purchase!
One thing for readers to keep in mind is that unless you know how to fight with a knife (and know that the assailant doesn’t have a firearm), then it’s a very bad idea to brandish a knife even as a threat. If the assailant is able to disarm you, then you’ll be in a much worse situation than if you didn’t have the knife at all.
This is actually a biological phenomenon that most humans experience! Our eyes are more attuned to greens and blues rather than reds, so green and blue light appear brighter as the cones in our eyes are more sensitive to those colors. Similarly, our cones are less sensitive to red so it appears darker.
There’s also a physics component to this as well since red light has about half the energy (twice the wavelength) as blue light. However, since there’s a difference in energy, the engineer must take that into account when designing multicolor LED applications so as to keep a level light intensity when changing or blending colors.
Here’s an eli5 question with some more info: https://www.reddit.com/r/explainlikeimfive/comments/ghx9g6/eli5_why_does_red_light_seem_darker/?rdt=58820
I’ve had this same issue with a smart TV and you’re suggestion was what fixed it