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2. Grow light - Wikipedia

   en.wikipedia.org/wiki/Grow_light

   Ficus plant grown under a white LED grow light. A grow light is an electric light that can help plants grow. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated (typically a varying combination of red and blue light, which generally appears pink to purple to the human eye).

3. 10 Grow Lights That Actually Work to Help Your Plants Thrive

   www.aol.com/20-stylish-grow-lights-plant...

   In low light environments, many plants will struggle to stay healthy. We tapped testers to find the best grow lights for all your indoor herbs and plants. ... Grow Lights for Indoor Plants ...

4. Your Grow Light Is Probably Too Far from Your Plants—Here's ...

   www.aol.com/lifestyle/grow-light-probably-too...

   Here's what you need to know to place grow lights at the right distance, depending on the type of light and the plants you're growing. Related: The 11 Best Grow Lights to Help Your Plants Thrive ...

5. Spectral power distribution - Wikipedia

   en.wikipedia.org/wiki/Spectral_power_distribution

   Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).

6. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. [1] This tube is filled with noble gas and often also contains suitable metal or metal salts.

7. Photosynthetic efficiency - Wikipedia

   en.wikipedia.org/wiki/Photosynthetic_efficiency

   Above about 10,000 lux or ~100 watts/square meter the rate no longer increases. Thus, most plants can only use ~10% of full mid-day sunlight intensity. [6] This dramatically reduces average achieved photosynthetic efficiency in fields compared to peak laboratory results. However, real plants (as opposed to laboratory test samples) have many ...