When the leaves curl, you're at the light saturation point for the plant so turn the dimmer down a few % and your plant will be "well fed".
How quickly did they uncurl?
Can Your Lights Be Too Bright?
- Thread starter Oldguyrealy
- Start date
How quickly did they uncurl?
Blue_Focus
Well-Known Member
This was from my light being to bright. The leaves was drooping too.
Since I turned down my light they're happy again.
Since I turned down my light they're happy again.
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amneziaHaze
Well-Known Member
Get a ppfd phone app turn to lux
Quick Guide – Lux Levels for Optimal Cannabis Growth
Life StageMaximumGoodMinimumVegetative70,000 lux40,000 lux15,000 luxFlowering85,000 lux60,000 lux35,000 lux
< 15,000 lux – sparse or “stretchy” growth – plant isn’t getting enough light
15,000 – 50,000 lux – a good amount of light for healthy vegetative growth
45,000 – 70,000 lux – the optimal amount of light for cannabis plants in the flowering (budding) stage. If grow lights produce a lot of UV light (such as LEC), stay on the lower side of this range
70,000 – 85,000 lux – a lot of light, some strains thrive at this light level, but some plants (especially auto-flowering and Indica strains) lose their top leaves early under this light intensity. At these levels, lights need to be kept further away for healthy growth
> 85,000 lux – at this light intensity, you’ve hit the plant’s “saturation point” which means your plant can’t use all the light (most strains will experience light bleaching or other major signs of stress at this level!)
Quick Guide – Lux Levels for Optimal Cannabis Growth
Life StageMaximumGoodMinimumVegetative70,000 lux40,000 lux15,000 luxFlowering85,000 lux60,000 lux35,000 lux
< 15,000 lux – sparse or “stretchy” growth – plant isn’t getting enough light
15,000 – 50,000 lux – a good amount of light for healthy vegetative growth
45,000 – 70,000 lux – the optimal amount of light for cannabis plants in the flowering (budding) stage. If grow lights produce a lot of UV light (such as LEC), stay on the lower side of this range
70,000 – 85,000 lux – a lot of light, some strains thrive at this light level, but some plants (especially auto-flowering and Indica strains) lose their top leaves early under this light intensity. At these levels, lights need to be kept further away for healthy growth
> 85,000 lux – at this light intensity, you’ve hit the plant’s “saturation point” which means your plant can’t use all the light (most strains will experience light bleaching or other major signs of stress at this level!)
Rocket Soul
Well-Known Member
That type of deficiency could be either too intense light in current environment or too weak nutes.
From research it seems very hard to hit the absolute too much light level with any growlight we use around here, but you may have a limiting environment or just too little nutes.