no LED . small size incandescent lamp. currently working with blue color .
Theoretical part :
Calculation based on Amount of transmission of light received in senor with tabe and without tabe( base zero value ) .
100% Transmission Value is zero color .
Based on the percentage of light intensity is inversely propositional to color concentration .
Amplifier Gain Part:
i couldn't conclude the Gain part . it's just development stage .
As of now i observed Dark Blue Tape and Light Blue tape giving different voltage . incase of yellow color i need check Measurement Linearity of Amplifier Gain response . i am working with this part now .
your suggestion is most welcome .