Since 6500K has more blue tones, it is similar to mid-day sun. Since 5000K is the lower value, it has more warm tones. Therefore, it can be hard to see the difference with the naked eye. Understanding the Difference Between 5000K and 6500Kĥ000K and 6500K are not that far apart on the Kelvin scale. flowers), and the type of lightbulb you are using, one or both values may be appropriate for your plants. 6500K for Plantsīoth of these values are in the range of daylight, so they are both considered adequate for plant growth.ĭepending on the plants you are growing, the goal for those plants (ex: foliage vs. Therefore, it is no longer as simple as using warm lights for flowers and cool lights for vegetables. Testing has shown that there can be a large difference in the amount of red or blue light emitted from different bulbs. Modern light bulbs come in different varieties (LED vs. On the other end of the spectrum, red light is said to be better for flowering plants. Historically, horticulturists have said that light sources higher on the Kelvin scale (blue light) are better for vegetative growth. The kelvin color temperature spectrum ranges from 0-10,000K. Warm white has red tones and has a lower number on the Kelvin scale. The best example of this is lightbulbs labeled as “cool white” or “warm white.”Ĭool white has blue tones and has a higher number on the Kelvin scale. Understanding Color Temperature for PlantsĬolor temperature is the color radiated by a light source. Oftentimes, a gardener finds the ideal color temperature through trial and error. There is a lot of debate amongst horticulturists and home gardeners around if there is any difference in using one over the other. However, 5000K is more similar to morning or evening sunlight while 6500K mimics midday sunlight. In general, plants can survive within the color temperature range of 2700K-7000K, so both 5000K and 6500K are within an acceptable range. What’s the difference between 5000K and 6500K? Both color temperatures are similar to natural sunlight. When using a grow light for indoor plants, the goal is to recreate the same light that the plants would receive from the sun outside. These numbers refer to the kelvin color temperature of light. Houseplant enthusiasts may feel perplexed when encountering grow lights labeled as 5000K or 6500K.
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