The difference here is solely based on how these technologies differ in dissipating heat produced by the amount of energy put into the luminaire. If both technologies produce the same number of BTUs per watt then why does it feel so much warmer under the HPS than the LEDs? Why can I mount my 600W LED so much closer to the crop than the 600W HPS? So, it will take less 600W LEDs to reach the same light level produced by the HPS. LEDs have now surpassed HPS in their efficiencies with some delivering over three micromoles of light per joule (Joule is a measurement of watts – one joule = one watt) while the HPS is closer to two micromoles per joule. If they both produce the same number of BTUs, then where is the savings in cooling an LED over an HPS? This is true for both the LED and the HPS luminaires. A single watt of power is equal to 3.41 BTUs so a 600W luminaire will produce 2,046 BTUs. If you have a 600 Watt HPS lamp, the BTUs for that luminaire are the same as a 600 Watt LED. ![]() When factoring in the heat given off by a luminaire, the BTUs are calculated off of the total wattage of the luminaire. A BTU is equal to the amount of energy used to raise the temperature of one pound of water one-degree Fahrenheit. When we calculate the load for heating/cooling equipment we use a measurement of energy called British Thermal Units (BTUs). ![]() However, there is a common misconception when calculating efficiencies. We also know that using LEDs can save an indoor grow in cooling costs while HPS lamps can save a growing operation in heating costs (especially for those in Northern climates). Both of these lighting applications have their pros and cons depending on the crop you are growing. Radiant HeatĪs growers are educating themselves more on different lighting technologies, we have been faced with questions many times over about what effects different light sources have on temperature and crop production what is the difference between Convection Heat and Radiant Heat?Īnyone remotely familiar with HPS (high pressure sodium) and LED lighting understands that you need to maintain a certain distance from your crop to the hot HPS luminaires, while cooler LEDs can be mounted closer to the canopy. ![]() He enjoys the outdoors, playing guitar and spending time with their grandson and five granddaughters.How LED and HPS Lighting can affect air and leaf temperature: The Effects of Convective Heat vs. There’s nothing like unsolicited positive feedback from a happy customer!īodden continues to live in north central Wisconsin with his bride of 46 years. One thing that Joe particularly finds fulfilling is explaining fairly complex subjects to fireplace customers and steering them to specific products that will satisfy their objectives. He was also selected several times by Hearth & Home magazine as a judge for the annual VESTA awards that recognize manufacturers creativity and innovation in product design and technology. During that time, Bodden was certified by the National Fireplace Institute in wood & gas technologies. Over 23 of those years have been in the fireplace industry, as the Hearth Division Manager in an organization that operates two retail shops. Bodden is a Wisconsin native and is semi-retired after 40+ years in marketing, sales and technical customer service work.
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