RGB LED based light driver using microprocessor controlled AC distributed power system

An apparatus for controlling multiple light sources to be mixed to form light of a predetermined color, said apparatus comprising:

• plural color sensors, for detecting an amount of light emitted from each light source;
• storage means, for storing predetermined values indicative of a desired amount of light to be emitted from each light source;
• and
• a processor, for comparing the amount of light detected from each light sources with a desired amount of light to be emitted from each light source and for adjusting a Pulse Width Modulated (PWM) signal inputted to a power source supplying the lights sources in response thereto,
• wherein said processor is connected to a separate computer, the computer including data and software for controlling the amount of light emitted from each light source based upon measured conditions and predetermined inputs.

A computer apparatus for adjusting at least one of a color and an intensity of light emitted to display products for sale, said computer apparatus comprising:

• a table of stored values indicative of desired relative values of each of plural light sources for each type of product to be displayed;
• an external interface for accepting from an input device information indicative of a product to be displayed with the light;
• and
• control logic for performing a table lookup and adjusting a Pulse Width Modulated signal to cause said light sources to emit said stored desired values.

A method of adjusting light used in a commercial refrigeration device to display particular products, said method comprising:

• storing a table indicative of a color and an intensity of light desired to be utilized for display of each of a plurality of products;
• accepting information indicative of a product to be displayed;
• performing a table lookup to adjust the color and the intensity of the light in a manner such that the product is displayed with the light desired;
• and
• adjusting at least one of an amplitude or a duty cycle of a Pulse Width Modulated (PWM) signal in a manner such that the color and the intensity of the light is properly adjusted.

A display device for a product to be sold in a retail environment or the like, said display device comprising:

• a shelf for holing the product;
• a lighting device attached to the shelf;
• and
• storage and input means for storing values indicative of a color and an intensity of a light to be used to display the product and for adjusting a Pulse Width Modulated (PWM) signal to alter the color and the intensity of the light being displayed in response to an input of information specifying the product being displayed.

A device for controlling a light, said device comprising:

• a stored table of products and desired lighting conditions for each product;
• means for inputting a specific product;
• means for adjusting the light to optimally display the product;
• and
• a pulse width modulation circuit for adjusting power delivered to each of a plural of light emitting diodes in response to the information stored in the table and information fed back from light sensors.