This product is suitable for indoor use only. The fitting has a 3-step dimmable function which is controlled by an ON/OFF switch (not included). Turn the power ON/OFF to the fitting 4 times within 2 seconds, the fitting will light up in the following order: Stage 1. Toggle the switch ON, the fitting will light up at 100% brightness. Stage 2. Toggle the switch OFF and then ON, the fitting will light up at 60% brightness. Stage 3. Toggle the switch OFF and then ON, the fitting will light up at 10% brightness. Stage 4. Toggle the switch OFF and then ON, the fitting will be at 100% brightness as in Stage 1. To switch back to 100% brightness at any stage, turn OFF the fitting, and then after 4 seconds turn ON the switch. The fitting will reset to 100% brightness. This globe is not suitable for use with Solid-state or Phase type dimmers.