Wow, your plants are looking nice, especially for your first grow!
Good job being attentive and noticing that some of those leaves are looking just the tiniest little bit paler than you might like.
I agree that starting some nutrients would be good and possibly backing off the light as they continue to grow closer. Also, the newer growth towards the top will naturally be a little paler when they're younger, so keep an eye to see if they stay like that or if they darken up as they age.
Whatever you do, don't rush things. Adjust one variable at a time and then wait a few days to see how the plant reacts otherwise it's easy to start feeling like you're chasing your tail.
Looks like you're doing a good job so keep it up!