April 24, 2021 1 Comment
Plants like this geranium become leggy when not grown in enough light.
When plants lack light, they don't produce chlorophyll (the green pigment in plants), and plants can turn pale green to yellow to white.
Plant stems become “leggy,” meaning stems become long and thin and appear to be reaching toward the source of light.
A lack of sufficient light causes the plant to grow long spaces on stems between the leaf nodes (the point where a leaf grows out from the stem).
Plants without sufficient light may also drop their leaves, especially older leaves.
You may find that a variegated plant (leaves that are white and green) may revert to being solid green.
Flowering plants may fail to produce flower buds.
Plants exposed to too much light may result in scorched and bleached leaves.
In order to calculate efficiency, coverage and harvest potential we need to use Photosynthetic Photon Flux (PPF) data. If you have a light fixture in mind, look for PPF or Photon Efficiency (PPE) data in the manufacturer’s literature or on their website. Manufacturers of high efficiency lights will usually report this data because it is a selling point. For most grow lights, PPF values are between 100 and 1500 µmol. Photon efficiency values are usually between 1.00 and 3.00 µmol/w.
PPF values are often called “PAR Value” or “Total PAR”. They measure the total amount of Photosynthetically Active Radiation (PAR) that a fixture will produce. This data will be reported as “µmol” or “µmol/s”. You can enter this data in the Grow Light Calculator in the field labeled “µmol”.
Unfortunately, many manufacturers of low-quality lights do not report PPF data. They instead try to manipulate Photosynthetic Photon Flux Density (PPFD) data to convince growers that the lights are more powerful than they are. PPFD is a measure of the density rather than the quantity of photons. The data reported in PAR maps is PPFD data. PPFD values are properly reported as µmol/m2/s. If you see the “m2” in the label, then it is PPFD data which cannot be used in the Grow Light Calculator.
Before getting a plant or starting seeds, determine the quality and hours of natural light in your space. Then choose plants with light requirements that match your indoor environment.
While a plant may tolerate lower light growing conditions, more light may be required to promote dense foliage and flowering.
(PPF: 50-150 umol m-2s-1 / 50-250 foot-candles / 10-15 watts)
(PPF: 150-250 umol m-2s-1 / 250-1,000 foot-candles / 15-20 watts)
(PPF: 250-450 umol m-2s-1 / more than 1,000 foot-candles, more than 20 watts)
With High Intensity Discharge (HID) lights, such as High-Pressure Sodium (HPS) and Ceramic Metal Halide (CMH) it became common to use wattage to determine how much light you need for your grow tent. With HID lighting, the rule is about 40 watts per square foot (430 watts per square meter). This means that a 600W HID grow light is adequate for a 4’ x 4’ grow tent and a 1000-watt HID light is perfect for a 5’ x 5’ tent.
Wattage was never the correct metric to measure the amount of light. It was a reasonable proxy for HID lights only because all HID lights convert electricity into usable light at about the same rate. However, LED grow lights can now be significantly more efficient than HID lights. The wattage rules no longer apply to most home growers.
High Pressure Sodium (HPS) have traditionally been the preferred HID light for flowering cannabis plants. When LED grow lights came into the market, many manufacturers tried to sell their lights by claiming an “HPS equivalency”. Since HPS lights were traditionally measured in terms of watts, LED lights came to be marketed with an “equivalent wattage”. However, there has never been a standardized way to make these “equivalencies”. Each manufacturer comes up with their own metrics to establish them and most are gross exaggerations. We advise you to completely disregard the manufacturer’s claims about “HPS equivalency” or “equivalent wattage”.
June 27, 2024
When choosing Best LED Grow Lights, you should also consider the durability of the lamp, energy efficiency and whether it can meet the light needs of specific plants. For example, the LED plant growth lights provided by Philips Lighting are designed for specific crops to promote uniform growth and improve quality and yield.
June 20, 2024
June 15, 2024
On Amazon, hot growth light types include LED Growing Lights, which have a variety of functions and features such as automatic on/off timing, red and blue LED light combinations, multiple dimmable modes, and flexibility for indoor potted plants or indoor gardens.
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September 10, 2024
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