Deficiency or

Based on general health of leaves, i'd wager it is climate-related. Maybe VPD is sky high? If it's been 1.8-2.0+ (based on atmopsheric reading and lower if correctly based on leaf temps) for an extended period of time, this is what plants will look like in that environment. could be too much light, but the node spacing seems okay, so this is less likely unless you recently amped it up not long before the droopiness. Too much light can also take a while before you see negative effects.. might look findn the first week and then start to get droopy near end of day for hours before it starts looking that way all the time. Not enough info provided.. what is seen can be caused by numerous things. Could be a medium with poor drainage/aeration, for example, which would be obvious if it only happens immediately after an irrigation. Normal irrigation should never cause droopiness and is a sign of a poorly constituted medium. If it's only immediately after lights turn on, that's fine as long as it's perky the rest of the light cycle. Bla, bla, bla... cause and effect.. numerous possibilities. hopefully something sounds familiar and is more likely the cause...