1.600 ppft sunlightNeeds to get filter in vegetative/flowering stage?

1600 PPFD in full sun—yeah, that's serious solar power, like full throttle from the universe. But if your plants are happy, standing tall, and not showin' signs of stress (leaf taco-ing, dry crispy tips, or midday droop), there's no real need to throw lace or filter over them just yet. Ladies especially those hearty hybrids you're running,can take a ton of light, especially in well-built soil with proper hydration and root room like your 35L pots. That white lace you’re thinking of? It might help in peak summer heat if they start lookin’ stressed or you're seeing sunburn. But for now, it’ll just reduce your DLI and could lead to stretching—especially since you're still in veg and want ‘em stackin' and spreading, not reachin' for light. Your humidity is low, yeah—15 to 20%—and the pots are drying fast. Smart move wrapping the fabric pots with plastic, that'll slow the evaporation. You could also mulch the top with straw, dried leaves, or even a light compost layer to keep that moisture locked in and support your soil biology. Bonus points if it helps shade those worm castings you're rockin’. Your environment (29°C days, 14°C nights) is solid for this stage. Just make sure your root zone isn't dipping too cold overnight. That can slow things down in veg. Bottom line: No need to filter sun unless they show real stress. Keep the soil moist, not soaked, and protect the top layer. You're doing everything right by reading the plant first.