Grow Lights

Choosing Your Grow Light: how light is measured

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Choosing Your Grow Light: how light is measuredChoosing which grow light system to make use of for your cannabis grow space is a mine of choices. HID? LED? T5? CFL? and apart from these major variations, there seems to be different ways of measuring the light outputted by each system– so how do you compare say one LED grow light from one business, with an HID bulb manufactured by another, with a T5 from Quantum?

The “color” of light sources comes from a complex relationship derived from a variety of various measurements, including correlated color temperature (CCT) or Kelvin temperature level (K), color rendering index (CRI), and spectral distribution (PAR Watts). However, color is most properly described by a combination of Kelvin temperature and CRI. CRI is a numerical indication of a light’s ability to render individual colors precisely. The CRI value comes from a comparison of the light’s spectral distribution to the standard (e.g. a black body or the daytime sky) at the same color temperature.

The higher the CRI the even more natural and dynamic the colors will look. A bulb with a CRI of 85 or higher is outstanding being that the sun has a CRI of 100. Eye Hortilux makes 90 -92 CRI bulbs that are made use of in fish tank, horticulture and other applications such as the 400W Eye Hortilux Blue 90CRI and 1000W Eye Hortilux Blue 92CRI. Standard Metal Halide bulbs have a CRI of about 70, so only 70 % of colors will be rendered properly.


HPS bulbs have a CRI of 22. KelvinThe K rating is a generalized kind of resolving the color output of a Light Bulb. Color Temperature is not how hot the lamp is. Color temperature level is the relative whiteness of a piece of tungsten steel heated up to that temperature level in degrees Kelvin. HPS has a warm (red) color temperature of around 2700K as as compared to MH at 4200K, which has a cool (blue) color temperature. The higher the kelvin temperature gets, the bluer. 10k lamps appear to be a great crisp white, while greater kelvin can go from a blue/white to really blue and lower kelvin appear more like that of sunlight (6500k). Metal Halide bulbs increase to 20,000 K (typically made use of in aquariums) supplying the bluest light.


The total noticeable spectrum is perceived by us human beings as white light, however the “white light” is actually separated into a spectrum of colors from violet to blue, to green, yellow, orange and red comprised of different wavelengths. Plants use heaven to red part of the spectrum as their energy source for photosynthesis. The various mixes and the relative intensity of various wavelengths of light identifies the CRI of a light source.Only part of solar radiation is utilized by plants for photosynthesis. This active radiation Picture artificially Active Radiation (PAR) contains the wavelengths in between 400 and 700 nanometers and falls simply within the noticeable spectrum (380– 770nm). The light in this area is called PAR watts when measuring the complete quantity of energy released per second. PAR watts straight shows how much light energy is available for plants to make use of in photosynthesis. Lumen is a measurement of light output. It describes the amount of light released by one candle that landeds on one square foot of surface located at a range of one foot from the candle.


Typically, lumens have actually been the standard of a lamps ability to grow plants; indicating the brighter the light the much better the plant. However, researches have actually shown that a wider color spectrum light will certainly carry out better than a light with high lumen output, especially when it comes to plant development. Lighting Spectrum and Photosythesis. The most typical mistake people make with plants is to not comprehend photosynthesis and the noticeable spectrum of lighting that influences plant growth. Most people pick lighting solely based upon the Kelvin temperature of a bulb.


This tells you very little about what type of light within the spectrum is being discharged and at what strength. Noticeable light is on a scale in nanometers (radiated wavelength) from 400nm (violet) to 700nm (red). Basic matter of photosynthesis: plants can only utilize light that is taken in. Bright light is necessary yet just a portion of this white light is utilized for photosynthesis. The blue and red zones of the visible spectrum are the most useful to plants. Eco-friendly plants appear green due to the fact that it is mirrored light. How “bright” a light appears has even more to do with just how much light is output in a provided location visible to the human eye, with “brightness” being at an optimum in the green spectrum (middle of noticeable spectrum, or around 550nm. There are no comments yet. Be the first to leave one!


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