the 430 is a flowering light.
the white residue is the salts from the nutes, happens all the time. The problem you will have with a timer on a drip system, is the salt buildup will be in ur tube or like and dry out when it shuts down. then, when the system kicks on, it will add concentrated salts right away till it dillutes and remixes with your solution.

Run your system all the time. When you do a solution change, be sure to rinse out ur ring/drip tube to avoid buildup.

I use fls for veg and 1000hps for flowering and have great luck.
Duke420 Reviewed by Duke420 on . Please help after several failed attempts Ok so me and my girlfriend bought a hydro system about 3 months ago and have failed to yield, I think primarily because we don't have a timer for our hydro system so the water continues to feed to the rocks without stopping. I'm not sure where to get a affordable timer that will allow water to be transferred only ever so often. In addition the nutrients we have are what came with the system, and may not be ideal. So we've decided to move soil. We also had a failed attempt at soil which is Rating: 5