First Grow - Thai Herer 99 - [Durban Thai x Jack Herer] x Cinderella 99

The seedlings have just reached 2 weeks of age. I gradually increased VPD from 0.6 to 1.1, and they started with a DLI of 13.3 (200 PPFD). By the end of the week, #4 showed some stretching, so I increased the DLI to 20 (300 PPFD). As a result of the VPD increase, I saw quite a bit of leaf curling at 1.1 kPa, so I've backed it down to 0.8. I went 9 days between waterings to see how they’d handle it, which caused mild drought stress. The soil had been very wet initially, so I let it dry out completely before giving 400 ml of distilled water with 1.3 ml/gal Cal-Mag, split between the four plants. They showed minor leaf scorching due to the drought and a test run where I accidentally left supplemental UV lights on too long, but no serious effects. Two sets of 30W supplemental UV lighting (Spider Farmer SUPP-UV30 x2) are running for one minute every hour while the main light is running. I plan to gradually increase this to 5 minutes per hour (max of 90 minutes a day) once there's more vegetative mass. Transplanting into final 5-gallon AutoPots is planned for next week. I have moved to a 24 hour light schedule. I wanted to keep my DLI around 20, so I lowered PPFD to ~230.