Furthermore the system comprises said one or more white LEDs, wherein a first terminal of the one or more white LEDs is connected to a first output port of the boost converter, and said {HEAD ~ programmable current source} to deliver {TAIL ~ a bias} current to the one or more white LEDs, wherein a first terminal of the current source is connected to VSS voltage 
to deliver
Furthermore the system comprises said one or more white LEDs , wherein a first terminal of the one or more white LEDs is connected to a first output port of the boost converter , and said { HEAD ~ programmable current source } to deliver { TAIL ~ a bias } current to the one or more white LEDs , wherein a first terminal of the current source is connected to VSS voltage
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