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Grow Lighting LED

Understanding LED Grow Lighting, Color Temperatures and Wavelengths:

Whatever plants, animals or tissue cultures you are growing indoors, the right mix of LED lighting can provide all the lighting needs for excellent growth and yield while reducing your energy and cooling costs and your carbon footprint!

White light color temperatures are referred to as CCT and are measured in Kelvin (K). i.e. The warm white CCT range is about 2700K-3000K. The 300K range difference is so slight that any temperature actually within this range should look nearly identical to the naked eye. Many LED manufacturers simply provide a CCT range and do not actually measure each finished product to confirm the exact Kelvin even though they may label the lights as a single number within the targeted manufacturing range. The actual finished products of the above mentioned range could potentially end up being 2850K+/-300-500K. If one light were to be at the lowest and another at the highest end of this new hypothetical range, the temperature difference could easily be enough to see with the naked eye. This is why similarly labeled color temperature products from different manufacturers sometimes look different.

As we go higher on the white light Kelvin scale, we progress from yellower light (warm) to white light to bluer light (cool). Incandescent and halogen lights are typically warm white and around 2500K-3000K. Direct sunlight is equivalent to approximately 4800K. Daylight is around 5500K-6000K. A cloudy sky is considered as cool white and can be found between 6000K-7500K. A clear blue sky can be found at 10,000K.

Colors of the light spectrum, such as red and blue light, are measured in nanometers (nm).

Different plant species and different stages of plant growth respond differently to variances in white light and variances in color spectrum of light made available to them. the number of hours a plant receives light also changes the optimal lighting mix required for the best growth and "fruiting".

Most plant green growth; bean or pea sprouts, herbs, seedlings prior to flowering stage and others, respond well to white light within the full sun to daylight ranges. When growing indoors, these stages of growth may also be enhanced by some ultraviolet to red light. However, a high concentration of red light may cause green growth to advance "too quickly" and plants may "reach" and not bush out or produce as well. The addition of some blue light in a good ratio to the red light will slightly slow this red growth effect allowing the plant to bush out more and produce better.

With cannabis, the green growth stage does well with a mix of red and blue spectrum light. Usually, somewhere between 7:1 - 11:1 R:B appears to be optimal for this species. Testing within this ratio range turn out very similar and since many factors affect growth and fruiting, the exact optimal ratio is left up for debate!