Welcome to the ultimate guide for plant lovers looking to understand and choose the right grow lights without getting lost in a maze of technical jargon! In this video, I simplify the process by breaking down key considerations, sharing personal experiences, and offering a genius hack to streamline your decision-making. Whether you're a seasoned house-plant grower, greenhouse grower, or just starting out, this guide has something for everyone. Watch until the end for a game-changing tip that will save you time and frustration. Don't let the complexities of grow lighting overwhelm you-let's make it easy together!
1. *PAR (Photosynthetically Active Radiation):*
- PAR refers to the range of light wavelengths (usually between 400 and 700 nanometers) that plants use for photosynthesis. Look for a grow light with a high PAR output, as this is crucial for plant growth.
2. *PPF (Photosynthetic Photon Flux):*
- PPF measures the total amount of light (in the PAR range) emitted by a light source per second, measured in micromoles per second (μmol/s). This is a crucial metric for understanding a light's ability to support plant growth. Higher the better.
3. *PPFD (Photosynthetic Photon Flux Density):*
- PPFD is the measure of the amount of PAR that reaches a specific area (usually one square meter) per second. It's an important metric for determining light intensity at the canopy level. PPFD is often more relevant than PPF for growers. Higher the better.
4. Kelvin: Kelvin is a numerical value that’s related to the colour appearance of the light - plants need different ‘colours’ depending on their stage of growth. But for most houseplant or tropical plant growers, look for a Kelvin reading of above 5000K - which is most similar to midday sunshine.
5. When talking about wavelength, sales ads will sometimes give a reading in nanometres (nm), usually from around 395 to 660nm, which promote various stages of plant growth. Providing you’ve chosen a light that offers ‘full spectrum’ then this reading is irrelevant to houseplant growers of established plants.
6. PPE - LEDs (AKA diodes) are sometimes given an efficiency rating in micromoles per Joule (µmol/J) - the higher the number - them more efficient they are.
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