Thanks CaneDog! Light is 21" above top of tallest plant. It's actually 2x qb288 on a heat sink. I has a hunch it was too intense, will dial back the dimmer or raise the light.
Late afternoon the leaves turn up, using a quantum board 288, dimmed to provide 7,000 lux. By morning the leaves will be flat and stay that way most of the day. Seems to get worse if I turn up the light? Thanks for any help.