Patent ID: 8373366

Claim:
A user interface comprising: a plurality of buttons associated with lighting scenes stored in a memory, wherein selection of one of the plurality of buttons selects an associated lighting scene as a focus light group including focus light sources, wherein remaining light sources are included in a surrounding light group; a contrast switch configured to change a ratio of the focus light group to the surrounding light group; and a brightness switch configured to change the total illumination intensity of the focus light group and the surrounding light group by multiplying by a factor both the focus group light intensity levels of the focus group light sources and surrounding group light intensity levels of the remaining light sources, wherein the focus group light sources have individual focus group light intensity levels related to each other according to a first relationship, and the remaining light sources have individual surrounding group light intensity levels related to each other according to a second relationship; and wherein the contrast switch ( 430 , 435 ) is configured to change the ratio by multiplying the individual focus group light intensity levels by a factor (R) and simultaneously multiplying the individual surrounding group light intensity levels by an inverse of the factor (1/R) without changing the first relationship and the second relationship.