How To Use Progressive Web App aka PWA On 420 Magazine Forum
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Depends on if you are in veg or not.
Either way, the suggested humidity is just that.... a suggestion. Or rather what growers have found to be optimal.
The only drawback to having a little less humidity than the optimum is you might experience a little slower growth. And by little I mean not enough to notice any major difference.
The real problems arise when you decide to go above the optimal levels.
Long story short it's better to have humidity be too low rather than too high