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LED grow lights are great because they are energy-efficient, durable, and have 'tuned' light spectrums to best meet the plant's needs. LED Grow Lights not only illuminates a room rather well and provides a nice warm glow but also is very environmentally friendly (no mercury). Fast and easy to install, convenient to control light spectra, increasing growth, and improving the yield appeal to more and more growers to change their HPS Lights.

There was a time when choosing a grow light was simple – all you needed to know was what brand and wattage you wanted. Things have changed. Drastically. The market has been flooded with grow light options and it can be quite challenging to figure out which light is best for you. NOTE: We also have a much more in-depth LED buying guide specifically for marijuana growers. Check it out here.

PAR This is not a measurement at all, but instead, a type of light that can be absorbed by plants (and coincidentally seen by humans). It ranges from 400 to 700nm. Lumens This is a measure of the total apparent brightness of a light source and not how many photons are produced. As the cliche goes, “lumens are for humans.” You can think of it as the brightness of a single candle (although the real definition is more complex). By in large, lumens are not a useful measure of light intensity for plants since they overweight colors like green and underweight reds and blues. For instance, 1W of radiant flux at 550nm (green, which the human eye is very sensitive to) is 675 lumens. One watt of radiant flux at 660nm (deep red) is only 45 lumens. The red light will be more easily absorbed by your plant in photosynthesis than the green one, but your eye will see the green light as 15 times brighter than the red light! Lux/Footcandle This measures how much brightness is striking a unit of area. Contrast this with lumen which is the total amount of brightness coming from the light source in all directions. Lux = one lumen per meter squared. Footcandle = one lumen per foot squared. Seedlings, clones, mother plants: 200-400 PPFD Early to late Veg: 400-600 PPFD Flowering: 600-900 PPFD Some of you may be wondering about the LED grow lights that produce over 900 PPFD. Will a PPFD higher than 900 produce bigger buds on your plant? The answer to that is yes - only if you run a high CO2 in your grow environment. CO2 is measured by PPM and the CO2 level outside is 400-500 PPM. Plants grow just fine with that amount of CO2. Some advanced growers will add CO2 into their grow room to get the CO2 PPM in the range of 1,000-1,500. Running a higher CO2 PPM like that will allow your plant to absorb more PAR. On the flip side, if you are not supplementing with CO2 and provide your plant with too much PAR, then your plant could encounter problems.

"The critical difference is that PPFD measures the density of these photons falling on a particular surface. PPF PPF (Photosynthetic Photon Flux) measures the total amount of light produced by a grow light in terms of micromoles of photons produced per second (often written as umol/s or μmol/s). This is an important number because unlike PPFD (which will be explained below) it can’t be manipulated and tells you the full amount of light coming from the LED grow light. PPFD PPFD (Photosynthetic Photon Flux Density) measures the number of micromoles of photons striking a square meter per second (often written as μmol/m2/s, μmol/m2/s, or μmolm-2s-1). Full daylight sun at noon in the summer is around 2000 μmol/m2/s. What your plants actually need, however, is likely to be much less than that. In fact, because the Sun’s intensity is only that bright for a small portion of the day and because the angle of that intensity changes throughout the day, providing that much light for an extended period of time would very likely be damaging to your plant. A ‘light response curve’ shows how effectively a plant utilizes light at differing intensities. Depending on the plant, at levels greater than 800-1000 μmol/m2/s the efficiency that a plant uses the light starts to slow. Meaning, you can provide your plant more light than this, but you might not see a huge change in outcome. It’s worth noting that some LED companies can increase their PPFD numbers by measuring extremely close to the grow light or using spot-light like reflectors or lenses. An LED company should always report what distance their PPFD numbers were taken at (e.g., 24 in, etc.)."

"In comparison to HPS lights, LED Grow lights have a much longer lifespan. With time, HPS bulbs may become dimmer and lose efficiency. Even the actual operating cost over the lifetime of an HPS bulb increases with usage. However, LED bulbs offer a bit more power at the end of their lives. As a grower, you are always looking for the best recipe for growth – ways to optimize results, minimize risks, and increase yield. You can realize this through predictable, high-quality, high production crops or plants delivered all year round. You aim to have maximum control over your investment and operational costs and want to find out how you can use LEDs to improve your business results. A successful LED-based growth strategy will result in a couple of promises. Control heat and light separately HPS VS LED grow light High levels of radiant heat can stress or even burn the plants. With LED lighting you can control heat and light separately. You can apply higher levels of light to plants with 67% less radiant heat than HPS lighting. A lower crop temperature means you will have to raise the ambient temperature in your greenhouse and manage the related change in humidity. More light, less radiant heat One important aspect is understanding how to grow your crops with LED lighting. When comparing the energy balance of LED lighting versus HPS lighting, the conversion of electricity into light and heat is different. Using the same amount of energy, LED modules deliver more light and less radiant heat. This does call for new growth strategies for high-wire crops. In conclusion, it's wiser to choose led grow lights. "