In terms of finding that sweet spot between your light source and the canopy of your plants, note that the ideal distance will differ according to the type of light, and the wattage of said light. Using common 400–600W HIDs as an example, we’d advise allowing 30–60cm between the canopy and the lamps. So, before we conclude our guide on achieving maximum yields with autoflowers, here is a list of the highest-yielding autoflowers from Royal Queen Seeds. 1. Northern Light Automatic. Northern Light is a legendary cannabis strain that derives from Afghan indica genetics. First bred in the 1970s US, and coming to Europe in the 80s, this indica is Major or macronutrients for autoflower plants. Nitrogen (N): Is a key component of amino acids, which form the building blocks of plant proteins and enzymes. Needed for fast and healthy growth, especially in the early stages. Phosphorus (P): Required for photosynthesis and plant development. 600W: 35–65cm. If you prefer light-emitting diodes (LEDs), then position your lights within these ranges: 400W: 40–75cm. 600W: 60–65cm. You can also use a lux meter to gauge where to place your lights. The metric of lux (lumens/m²) can help growers nail light positioning further, and thereby optimise plant performance.
Do autoflowers need direct sunlight? An autoflower outdoor grow needs to be in direct sunlight for the plants to receive enough UV light to grow to their potential. At the bare minimum, outdoor plants should get 10 hours of sunlight per day with 12 to 16 hours being optimal.

Most indoor growers report getting great growth rates when keeping light schedules on an 18/6 light schedule (18 hours of light and 6 hours of dark each day). 20/4 is another popular light schedule for indoor auto plants. Some growers will give 24 hours of light to auto plants, but others believe that auto plants develop better when given at

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how much light do autoflowers need