Tuning allows you to change the warm vs. cool quality of a light to create the white light quality you want and need with your LED Smart Bulb.The conventional design of LED Smart Bulbs is that white light is used for task lighting (reading, cleaning, etc.) while RGB is used to establish atmosphere and mood. The lumen count you see on the Lighting Facts label and our product spec sheet for each Sunco LED Smart Bulb applies to the CCT scale (2700K-5000K) and not to RGB output. RGB brightness (lumen count) is therefore lower than when you select the color white in the Smart Life App for your LED smart bulbs.