I'm trying to use them in a closure that is at the @Field static level, and the compiler isn't finding them. I wanted to try and import the package or precede them with their full package name, but I am not sure what that is.
I tried some variations like ...
hubitat.helper.ColorUtils.convertTemperatureToGenericColorName()
They work in normal not @Field static level code, but as mentioned, this is an odd case of using them in a closure that is at the @Field static level, so I think I need the full package name or to import the package.