You asked about mixing the red and blu spectrum lights. If you have the option, a mix of the 2 spectrums is better than just 1.

Are you adding any nutes yet? Yellowing is generally a sign of a lack of Nitrogen and droopy leaves are usually a sign of over watering.

How often are you watering? For soil it's best not to water everyday. More like every 3 days, but this is dependant on pot size.

Do you have drainage holes in the bottom of your pots to let excess water run off? If not, add some.