Light emitting device

A light emitting device comprising:

• a first plurality of light emitters comprising a first group and a second group, wherein said first group is connectable in series to said second group;
• a second plurality of light emitters comprising a third group and a fourth group, wherein said third group is connectable in series to said fourth group, and wherein said second group is connectable in series to said fourth group;
• a first driver connected to said first group;
• a second driver connectable to said second group;
• a third driver connectable to said third group;
• a first voltage comparator coupled to said first driver, wherein said voltage comparator compares the voltage of said first driver to a predetermined voltage;
• wherein said light emitting device is in a first state when the voltage of said first driver is less than said predetermined voltage;
• wherein said light emitting device is in a second state when the voltage of said first driver is greater than said predetermined voltage;
• wherein when said light emitting device is in said first state, said first group is connected in series with said second group to form a series circuit between said first driver and a reference voltage, and said third group is connected in series with said fourth group to form a series circuit between said third driver and said reference voltage;
• and
• wherein when said light emitting device is in said second state, said first group is connected between said first driver and said reference voltage, said third group is connected between said third driver and said reference voltage, and said second group and said fourth group are connected in series between said second driver and said reference voltage.

A method for controlling a light emitting device, said light emitting device comprising:

• a first plurality of light emitters comprising a first group and a second group, wherein said first group is connectable in series to said second group;
• a second plurality of light emitters comprising a third group and a fourth group, wherein said third group is connectable in series to said fourth group, and wherein said second group is connectable in series to said fourth group;
• a first driver connected to said first group;
• a second driver connectable to said second group;
• and
• a third driver connectable to said third group;
• said method comprising:
• monitoring the voltage of said first driver;
• connecting said first group to said second group if the voltage of said first driver is below a preselected value;
• connecting said third group to said fourth group is the voltage of said first driver is below said preselected value;
• and
• connecting said second group to said fourth group in series, wherein the series connection is connected to said third driver if the voltage of said first driver is above said preselected value.