All basement grown, area of about 2x3m, max height 1.85m (that’s 7x10x6 ft approx). Foot candle is a measure that describes the amount of light reaching a specified surface area as opposed to the total amount of light coming from a source (luminous flux). I go for LED lighting. Lumens are "the overall light output or quantity of light produced." LED lighting is also ideal for the flowering stage as they produce a lot of lumens. Outdoor Lighting, Nice Blog dear, with the technology today will be more uses of these useful lights in the future. Although. The difference is that sodium vapor lights were the most efficient technology of the 1970s while LEDs are the modern day equivalent. I was researching LEDs, and they seem to be less efficient: a 70 watt HPS bulb produces around 6,000 lumens and the 70 watt LED fixtures produce around 4,000. Typical source efficiency ranges 37 and 120 lumens/watt. This is by far the biggest downside that needs to be considered. They also have the advantage of emitting some light in the UV spectrum. Typical source efficiency ranges 37 and 120 lumens/watt. The principal difference between low and high pressure sodium lights is the operating pressure inside the lamp. Wall Pack Lighting, We are testing the top rated LED fixture vs the top rated 1000W double-ended HPS fixtures at our Medical Cannabis grow in Northern California. To begin, let s unpack the information that exists on this complex topic. As the gases heat, they emit light. The up-front costs of an LED lighting project are typically greater than most of the alternatives. It has revolutionized the lighting industry. LED Lighting, I have the possibility to buy 16 4ft LED strips @50uMol/s @25W each and would hang these @10 inch above the canopy. 3. The typical lifespan for a fluorescent bulb, by comparison, is 10-25% as long at best (roughly 10,000 hours). Low and High Pressure Sodium Lamps come in all shapes and sizes but are typically used for outdoor applications where size isn’t a major factor. Is that the only thing it determines? They do, however, show degraded performance at significantly high temperatures and they require significant heat sinking, especially when in proximity to other sensitive components. Have you ever grown using a combination of LED and HPS? Low and High Pressure Sodium bulbs are long lasting but will still require replacement several times in addition to the labor cost to monitor and replace aging or expired components all within the lifespan of a single LED. 150 Watt. The typical 100W-equivalent LED light costs somewhere between $10 and $20. We would love to hear from you in the comments below. The two different technologies are entirely different methods of producing light. Compare lumens to watts Lumen is the term used to describe the total amount of light emitted by a light source, while wattage merely indicates the amount of energy it uses. You get a variety of coloration, not available with other lights – what you get outdoors really. Sodium, mercury and xenon are the three elements inside the tube, used at different stages of ignition (and for different colored light). HPS Grow Lights. A guide on the concept of PAR can be found here. Your email address will not be published. LEDs are solid state lights (SSLs) that are difficult to damage with physical shocks. When current passes through the semiconductor material the device emits visible light. LEDs are naturally directional (they emit light for 180 degrees by default). High Pressure Sodium lamps emit visible light across a slightly more broad spectrum than Low Pressure Sodium lamps, they are still very limited. If LED cost the same as HPS, would you choose LED? 200 Watt. Works so great the LED keeps the nodes closer together. Minus 40 Degrees Celsius (and they will turn on instantaneously). One of the biggest aspects of indoor cultivation is lighting. The downside is that there are very few options outside the narrow range to choose from. 250 Watt. I, anybody know about led? So the new lights will pay for themselves easily on the first plant (a blueberry strain). It’s difficult to make a straight conversion if you’re trying to factor in all the ways in which LED and HPS are different, but the average 600w LED will use about 400w when running at full strength, and the average 1000w LED will use about 900w. For this reason they are very efficient. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). The HPS vs LED grow light matchup is a clash of the titans. Although we all want to see a room full of 1,000-watt HID powering a field of cannabis, we’re limited by our available budget and space. However, when we consider LEDs, light output has already exceeded 300 lumens per watt in the lab. This also ensures that there is sufficient light once plant size has increased. Perhaps more importantly, in the last few years LED efficiency has surpassed that of even LPS and HPS lights and its efficiency improvements are progressing at a much more rapid rate. On one side of the junction is a material that has been treated with extra electrons, while on the other side is material that has been treated to lack electrons. (Don't give up if you received an expensive proposal to upgrade to LEDs. In the beginning, all we had was the standard, incandescent light bulb. LED Retrofit, They are also adaptable for large public areas (which require powerful, efficient lights over a large area), road lighting (which offer significant color advantages over low and high pressure sodium lights), and parking lots. LPS and HPS still retain these advantages over most conventional bulbs but they lose on all three counts to LEDs. LED lifespan can be greater than 100,000 hours (more than four times that of LPS or HPS). 7. When buying Leds dont go by the rated wattage always go by what the Led actually pulls from the socket, the better quality Leds are always those with a higher draw from the socket, anything from about 400 actual watts upwards. By far the most efficient HID variant is the Low Pressure Sodium lamp whose source efficiency can range from 60-190 lumens/watt. The only real potential downside to this is when LEDs are used for outdoor lighting in wintery conditions. Roughly 15% of the emissions are lost due to energy dissipation and heat losses. If so, using methods like the Scrog method would mean I would need less wattage for penetration? Low and High Pressure Sodium costs vary depending on the specific type of light. Growers can increase the amount of light globes as the cultivation process progresses. Another way to decrease the cost of lighting is, as mentioned earlier, to start with fewer lights and increase as the plants mature. Although sodium vapor lighting beats virtually every other technology in terms of energy efficiency (which is why it was chosen to illuminate the streets of so many cities), it loses out to LEDs. Once knowledge increases of different lighting systems and their effects, they can be combined. For example, Lumatek’s 600W bulbs have a PAR output of 1,030 µmol/s. That's almost a 33 percent efficiency increase over the efficiency of the spiral CFL from GE. When voltage is applied, the extra electrons move across the junction to fill the “electron holes” on the other side. A little extra light, but its showing to pay off in the results. Lumen maintenance at the end of life still is excellent at around 80%.” LPS lights last slightly shorter periods of time (typically failing around 18,000 hours of operation). LEP lighting technology is still miles behind HPS and LED, and does not produce yields as big as other lighting systems. Broken bulbs release a small amount of toxic mercury as a gas and the rest is contained in the glass itself. at certain voltages, current levels, or light intensities). They produce steady light without flicker. All High Intensity Discharge lights (of which HPS and LPS are examples) emit light omnidirectionally. I use 600 watt led for veg and 600 hps + 600 mh for flower. This means they emit light for 360 degrees, requiring fixture housings or reflectors to direct a large portion of the emissions to the desired target area. They are a bit blue for flowering, but is just happens that I have a strip LED with 12 x 2 watt pure 660nm wavelength, which I am hanging between the two flood lights. Fluorescent lights suffice during early growth as seedlings and young plants don’t use as much light as fully matured plants. The scotopic lumens provided by each light source would then be the following: LED scotopic lumens = 12,000 lm x 2.0 = 24,000 lm HPS scotopic lumens = 40,000 lm x 0.5 = 20,000 lm. Using the table, we can see the mean lamp lumen output for our customer’s 250w high pressure sodium wall pack is 27,000 lumens. Currently, the highest-performing HPS bulbs produce around 150 lm/W. Our, The first practical use of LEDs was in circuit boards for computers. Sensi Seeds therefore strongly advises you to check your local laws and regulations. LED grow lights don’t lose intensity like HPS bulbs and are typically just as bright until the very end of their life cycle with a general lifespan of 50,000-100,000 hours. LEDs are probably the best contenders in terms of spectrum at this stage, with newer full-spectrum models offering up to 11 bands of light wavelengths most needed by plants. L70 in hours It is very much the opposite of a photovoltaic cell (a device that converts visible light into electrical current). For this reason LPS lights are actually desirable as they minimize electromagnetic interference near facilities conducting astronomical observation. In the meantime, I hope you continue to enjoy the blog! Most values for LED system efficiency fall above 50 lumens/watt. For LED grow lights, lm/W is generally considered less meaningful than the PAR output. Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source. According to American Electric Lighting, “HPS lamps still generate 90% of their initial light output at the midpoint of their life span. Why not compare a double ended his / mh . I seriously think that I’m going to get a Hans panel in the near future (after vacation, that is). Heat output also increases with additional current which decreases the lifetime of the device. As indicated by the name, “high” pressure sodium vapor lights operate at a higher internal pressure. In some cases (particularly with older HID bulbs) dimming can cause the light to prematurely expire. If you have any information please, Energy Service Companies (ESCO)/Contractors. Much like fluorescent lights, modern LED lights are a wonderful solution for gymnasiums, warehouses, schools and commercial buildings. The downside is that there are very few options outside the narrow range to choose from. However, when you consider it as a 200-watt light, the difference would look like this: 200 watts x 120 lumens/watt = 24,000 total lumens effective output. Much like fluorescent lights, modern LED lights are a wonderful solution for gymnasiums, warehouses, schools and commercial buildings. CRI for LED is highly dependent on the particular light in question. I have switched recently to a white floodlight style LED light setup. I can also witness an improving effect on smell and taste – better photosynthetic abilities due to the leds possibly? We have covered this question in past posts on our blog, like this one by our very own head of marketing: LEDs vs Traditional Lighting but most cannabis growers know that this crop is different than most and many growers have experimented with lighting technologies on a small scale to find they can sometimes increase terpenes and THC levels just by changing their light sources. This means that hobby gardeners and botanists can cultivate all year round without the limitation of seasons. If you checked this debate five years ago, HP… 200-watt HPS bulbs provide about 22000 lumens of light. The up-front costs of an LED lighting project are typically greater than most of the alternatives. This does not include ballast draw which can add another 15% of energy consumption. LEDs emit light for 180 degrees. The ultimate purpose of the device is to emit light, not heat. So, what are some target LPW ranges for the lamp type you're buying? Among the deficiencies in this lighting are the following: Among the minor deficiencies in sodium vapor lighting are the following: Common applications for sodium vapor lighting includes street lighting and parking lots as well as for tunnel lighting where color rendering isn’t a major issue. Since then they have gradually expanded their applications to include traffic lights, lighted signs, and more recently, indoor and outdoor lighting. Once the arc is ignited it melts and evaporates metal salts (sodium) internal to the device. Lm/W is a measure of what is visible to the human eye. 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