It also means that more accessory parts are required in the light fixture itself in order to reflect or focus the luminous output of the bulb (thus increasing unit costs). Neither compare to the small size and robust build of a solid state light like LED. For example, at a CCT of 4100 K, there are nine models rated at 2950 initial lumens. The ultimate purpose of the device is to emit light, not heat. Rated initial light output of T8 fluorescent lamps*, Figure 2. For 2’ bulbs at 17 watts and 3500k, you would get 1300 lumens. LEDs fail by dimming gradually over time. Fluorescent light is omnidirectional meaning it emits light for 360 degrees, requiring fixture housings or reflectors to direct the emitted light. at certain voltages, current levels, or light intensities). Fluorescent lights can present waste disposal issues due to their reliance on mercury. If you have any information please, Energy Service Companies (ESCO)/Contractors. Lighting—it’s all about lumens. Broken bulbs release a small amount of toxic mercury as a gas and the rest is contained in the glass itself. LED vs Fluorescent: 10 Problems To Consider With Fluorescent Lighting, How to Calculate Total Fixture Wattage for Fluorescent Lighting, T5 vs T8 vs LED: The Best Options For Replacing Aging T-12 Fixtures, 400 Watt Metal Halide Replacements: LED Highbay vs. T5 Highbay, How To Calculate Lighting Costs For Metal Halide Fixtures, Energy Efficient Lighting:How To Calculate Cost 23 Watt Bulb. Further, fluorescent lamps require the use of a ballast to stabilize the internal current that produces light. For example, at a CCT of 3500 K, there are five RE70 models available with a rated initial light output of 2800 lumens and eight models available with a rated initial light output of 2850 lumens. Once the arc is ignited it melts and evaporates metal salts internal to the device. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. LEDs are an ideal light for purposely turning on and off because they respond rather instantaneously (there is no warm up or cool down period). Fluorescent lighting used to require a “warm-up” period in order to evaporate the internal gas into plasma, but now there are several near-instantaneous starting technologies for fluorescent light (those include “quick-start,” “instant start,” and “rapid-start”). Voltage requirements in fluorescent bulbs are balanced by a ballast (a magnetic device in older bulbs and an electrical one in newer fluorescent technology). 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). Fluorescent lights actually produce primarily UV radiation. LED lighting has relatively high initial costs and low lifetime costs. But what are lumens, exactly? New LEDs can last 50,000 to 100,000 hours or more. Omnidirectional lights produce light in 360 degrees. Correlated Color Temperature (read more here). Heat output also increases with additional current which decreases the lifetime of the device. Figure 1 shows the range of values for rated initial light output that are presently published for 121 lamp models by nine manufacturers for different correlated color temperatures (CCT). The measured light output values of the RE80 lamps were, on average, 2.7% lower than their rated values. The technology pays the investor back over time (the payback period). Fluorescent bulbs contain inert gas within the glass casing while LEDs are a solid state technology. For example, light that is being directed at the ceiling rather than the room is wasted light. The typical 100w-equivalent LED light costs somewhere between $10 and $20. If you’re interested in the technical details of how an LED works you can read more about it here. CFLs are much smaller. They lose out to LEDs principally because their system efficiency is much lower (<30 lumens/watt) due to all of the losses associated with omnidirectional light output and the need to redirect it to a desired area. ethods of producing light. It’s usable light that is directed towards it’s intended surface vs. scattered and lost from the fluorescent source. Since then they have gradually expanded their applications to include traffic lights, lighted signs, and more recently, indoor and outdoor lighting. ng than incandescent bulbs, however, they fail in both categories when compared to LED. Using the chart we can see that if you want to replace a 40W incandescent light bulb with a compact fluorescent (CFL), you will likely need a 7W CFL. Starting is relatively simple with small tubes but can require significant voltage with larger lights. Most values for LED system efficiency fall above 50 lumens/watt. What’s the Difference Between it and a Watt? This program is administered by the National Institute of Standards and Technology (NIST). Energy Efficient Lighting: What Are Light Distribution Patterns? © 2012 Hovey Electric | 989.631.2023 | 2936 E. Venture Dr. | Midland, MI 48640, Industrial Maintenance and Troubleshooting, Hovey Led Lights Square LED Pendant Highbay. They generate visible light because the bulb is coated with a layer of phosphor which glows when it comes into contact with UV radiation. If you have any information please contact us. Why "Lumens" Are Important To Your Energy Efficient Lighting Analysis, Highbay Options: T5 vs T8 vs 400 Watt Metal Halide vs LED Highbay, 4 Major Advantages to Buying C9 LED Christmas Lighting, 7 Reasons to Choose LED Christmas Lights This Holiday Season. Generally they are cheap compared to LED ($3-$10 for a 100w incandescent-equivalent CFL bulb). LEDs are very efficient relative to every lighting type on the market. Day 1 - You have a 4 bulb fluorescent fixture @ 2850 lumens per bulb netting 11,400 lumens. There is such a thing as an IRED (infrared emitting diode) which is specifically designed to emit infrared energy. The first practical use of LEDs was in circuit boards for computers. LED dimming functions by either lowering the forward current or modulating the pulse duration. LEDs emit light for 180 degrees. As good as fluorescent light efficiency has become, LED is better (and continues to improve at a more rapid pace). This is usually overcome with LEDs by covering the light with a visor or facing the light downward towards the ground. The number of available models for each rated initial light output is represented by the size of the bubble. Traditionally, we’ve referred to light bulbs by their watts because most people used Day 1 - You have a 4 bulb fluorescent fixture @ 2850 lumens per bulb netting 11,400 lumens. instant start - A method of starting fluorescent lamps in which the voltage that is applied across the electrodes to strike the electric arc is up to twice as high as it is with other starting methods. hbspt.cta._relativeUrls=true;hbspt.cta.load(510865, 'd17232a8-88b0-4753-91ae-935cde930c17', {}); LED stands for light emitting diode. Can You Really Determine The Correct Lumen Output? Fluorescent and CFL lights are very efficient compared to incandescent lights (50-100 lumens/watt source efficiency). Figure 1. Perhaps more importantly, broken fluorescent bulbs require special handling and disposal due to hazardous materials like mercury inside the lights. All in all this makes the applications in which LEDs can be used extremely diverse. LEDs emit electromagnetic radiation across a small portion of the visible light spectrum and don’t waste energy by producing waste heat or non-visible electromagnetic radiation (such as UV). Well here’s a head-to-head comparison of the two followed by an in-depth discussion of each technology in turn.