Humidity for indoor growing under l;ights

[dreamerfb2]

I use a gravel bed which I refill once a day, just to ALMOST cover the gravel. Two muffin fans work to give a little breeze and disperse humidity. Seems to work perfectly. My area is normally around 75-85% humidity. I say "normally" but now in severe draught on the Northern California coast. Last three days have been "normal" as the fog has not lifted at all! If I put plastic "green-house" cover over the plants I can get 90% humidity, and temps up to 85 degrees! Seems to work well, but I think temps get way to high. Gonna move ALL outside next week, let them adjust. New growth everywhere.