OSC Color Temperature feature and key

/eos/wheel/color_temperature=0.5 works if the parameer of the fixture you're trying to control is actually Color Temperature.

All parameters are available over OSC via the path "/eos/wheel/parameter_name"

The parameter name needs to be lower-case with spaces replaced with underscores.

However, as Ueli said, this will only work if the fixture has an actual parameter of that name on a console encoder.

Some times ago I figured out that parameter names are not case sensitive and underscore is also not necessary.

See following post for naming conventions  RE: OSC for new Eos 3 features