Gun safe humidity

[3S16]

What would you consider the optimum % of humidity in a gun safe to discourage rust? I have a humidity meter in my safe that I try to keep around 25%. Just a random number that seems good to me. I live in mid-coast Calif. and use just an appliance light bulb in the safe to develop enough heat to maintain low humidity.
I know there are commercial humidity "sticks" designed for this.

 

[Road Rat]

I have a Golden Rod Dehumidifier in my safes. Works for me.

However, your "small" bulb will probably work also. How small?

 

[Kanewpadle]

Constant temperature change is not good. Condensation will rust your guns and the safe itself.

Use a golden rod if you must. I never used one. I keep the temperature constant and use gun socks. Been working well for me for years.