Spectral transmittance requirements. The green lines are the straight-line fits. The annotations on the plot are defined below:
- λS= 380nm. λS is the straight-line fit intersection with the wavelength axis for T values between 10% and 80% (on the short wavelength side). 
- λL= 648nm. λL is the straight-line fit intersection with the wavelength axis for T values between 90% and 20% (on the long wavelength side). 
- λ∆S= 20nm. 
- λ∆L= 25nm. 
- Minimum ∆PB: 225nm. ∆PB is the spectral width of the pass band. 
- T > 80% min. @400-420nm. 
- T > 85% min. @420-600nm, with the average T >90% in this pass band. 
- T < 5% @ 685nm. 
- T < 3% @700nm. 
- Average T < 1% between 750-1100nm. 
- Maximum T <3% between 750-1100nm. 
- Average T < 1% between 300-380nm. 
- Maximum T <3% between 300-380nm. 
- Incident angle: 0 degree. 
