I was playing with my stats last night and selected +20% Light Damage from both Blue & Red lines. To be honest I kind of assumed one of them would work and the other would not. I was surprised to see that they did work but the exact number did not work out right and I am wondering if someone can tell me why.
I forget the gambit I used for testing (Desolation, maybe??) anyway the base (not DoT) damage with neither of the +% light damage having points was 2119. Add +20% Light Damage from Blue line and +20% light damage from red line and the gambit's base damage goes up to 2911. If i am doing my math correctly (and trust me, I may not be!) that works out to an increase of about 37.375%
I was using the same legendary weapon for the test (95 SA), it did not have the light dmg LI on it - although I did not check if I had some other LI which might affect it, will have to do that.
Please understand, I am not complaining. I am just curious if I am missing something in my math or if someone has an explanation why it is ~37.375%