do light green leaves by mid flower = smaller final yield?

hi guys and gals. i'm in mid flower in a 40 gallon rdwc system (8 pots). i'm feeding AN a & b at half recommended amount 100ml, a very weak amount of calmag plus (20ml), 15ml silicon, AN big bud @ 100ml, 20ml orca, and 35ml liquid karma.

i've got a gavita @ 750watts on a light rail and on top of that 4 clusters of bud master led's. and i also run a water chiller and the water is a constant 66.2f. air temps with lights on is 78.8f and off is 69.8f.

i'm experiencing a problem with the colour of my leaves which i feel may affect my overall final yield and i'm not sure how to fix the problem. the leaves are light green all over from bottom to top. sorry i can't post pictures at this time.

i'm wondering if my nute levels are too low - especially the calmag -or if my water temerapture in the roots is too cold?

It's a nitrogen deficiency.

Might wanna up them nutes but your yield is governed mostly by the amount of wattage you aim at them. A weak ppm means your plant is consuming nutrients provided but even a light toned plant will still flower as normal. Less is more; the plant is telling you it can handle a higher ppm. Cal/mag is needed to help absorb the other elements like nitrogen so yes too low a dose of cal/mag over time could leave your plant a minty light green as opposed to a lush deep kelly green but not to worry just up the ppms a bit & keep an eye on ph. I doubt your chiller is locking out nutes...those temps seems very good to me.

thanks richard, to be honest you've basically confirmed hat i've been thinking too. i think i'm alright with my lighting as i have a total of 1250 watts combined with the gavita and leds