Why doesn't a lightbulb help a plant?

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SUMMARY

The discussion centers on the effectiveness of artificial light sources, such as incandescent light bulbs, in supporting plant growth compared to natural sunlight. It is established that incandescent bulbs emit light primarily in the red spectrum due to their lower filament temperature, which is significantly cooler than the Sun's temperature of approximately 5,700 Kelvin. This results in a less effective light spectrum for photosynthesis. The conversation also highlights that while natural light is often deemed superior, many commercial lighting options are available that closely mimic the Sun's spectrum and can effectively support plant growth.

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  • Understanding of photosynthesis and light spectrum requirements for plants
  • Knowledge of incandescent light bulb technology and its spectral output
  • Familiarity with the concept of blackbody radiation and temperature effects on light emission
  • Awareness of commercial grow lights and their specifications
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  • Research the spectral output of different types of grow lights, including LED and fluorescent options
  • Learn about the principles of blackbody radiation and its application in lighting technology
  • Investigate the specific light spectrum needs of various plant species for optimal growth
  • Explore the effectiveness of different artificial light sources in comparison to natural sunlight
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Botanists, horticulturists, indoor gardeners, and anyone interested in optimizing plant growth through artificial lighting solutions.

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I have a plant in my living room that doesn't get much light, and so it doesn't do very well. I've always been told that light from normal lightbulbs doesn't help because it's not "natural" light. But then I started thinking. The filament glows from the current and I'm just wondering what makes the emitted light not "natural"? It's just something that gets red hot from something and so emits light? Also - theoretically - if I could build a campfire in my room that would probably work since that would undoubtedly be natural light right? I mean, what is the sun if not just one huge campfire?
 
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The sun is a blackbody (basic thermal radiator) with a temperature of about 5,700 Kelvin. This temperature causes it to emit the greatest energy in the green and yellow parts of the spectrum. A typical light bulb filament is much cooler than this, and produces most of its light in the red part of the spectrum.

A fire (campfire or candle flame) is also too cool to produce Sun-like light. The distinction between "natural" and "unnatural" light is immaterial -- light is light. There are many kinds of commercial lights on the market with spectra that are close to that of the Sun.

- Warren
 

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