How to distinguish between Ozone and Ozone-free according to the bulb outlooking?

How to distinguish between Ozone and Ozone-free according to the bulb/tube outlooking?

Actually, there is a simple way to find the difference(find the symbol O3).

Example as below:

Or, try to find the printed "Ozone". Example as below:

 

Distinguish between ozone and ozone-free