The button's lamp effect produces an cause the button to behave similar to a lamp by illuminating the button according to the the Luminance value.
Check the Enable Lamp Effect to get access to the lamp effect settings page.
Select Lamp Effect on the left to display lamp effect settings page.
(1) Specify the luminance when ON. The luminance is modulated based on the button's design and whether or not it is pressed.
(2) Specify the luminance when OFF. The luminance is modulated based on the button's design and whether or not it is pressed.
(3) Specify how the ON/OFF state is determined. The options are similar to those of the lamp widget.
(4) If a valid bit address is selected in the General Settings page, the Synchronize with the Bit Write Address checkbox will appear. If checked, the same address is used for the lamp effect's ON/OFF state.