Lumens vs Watts, what’s the difference? Some fixtures produce more light at the same input power than others. The energy used is measured in watts, while the brightness of the light output is measured in lumens. Lumens measure the brightness rather than energy consumption. The wattage used is not directly related to the lumen output. Some fixtures have a higher efficacy. This means that the technology generates more lumens per watt. An efficient fixture will put out more lumens per watt (LPW) than an inefficient fixture.
This is really relevant for any organization, property owner, architect, or electrician. Lighting typically accounts for nearly 40% of a commercial building’s power bill. Also, a higher LPW ratio reduces the heat generated to produce the light. HVAC loads are affected by lighting loads. Every watt of power used by your lighting system generates 3.414 BTUs. More wattage means more heat; the HVAC must compensate for that heat.
While LPW is important, it is not the only consideration. Maintenance of the lighting, light quality, and the application of the area being lit must also be taken into consideration. Still, an efficient lighting system will deliver quick payback to your organization. If you are not sure what fixtures to use for your project, the staff at Access Fixtures will be glad to help you select the right lighting fixtures.
Introduction to Lighting
When it comes to selecting the right lighting for your space, understanding the basics is crucial. Lighting is a fundamental aspect of any setting, whether it’s a home, office, or outdoor area. The type and amount of light used can greatly impact the ambiance, functionality, and energy efficiency of a space. In this guide, we will explore the world of lighting, focusing on key concepts such as lumens, watts, and LED technology. We will also discuss how to choose the right light bulb, including factors such as light output, energy consumption, and color temperature. By the end of this guide, you will be equipped with the knowledge to make informed decisions about your lighting needs.
Wattage
Light fixtures and comprehensive lighting systems require electricity in order to produce light. The amount of electricity is measured in watts (W), which indicates how much power a light fixture consumes. Utility companies measure watts expressed as kilowatts (1000 watts = 1 kilowatt); this is how they calculate monthly electrical bills. Reducing the wattage of fixtures used for lighting reduces energy use and, consequently, the power bill, leading to using less energy.
Lower watts indicate reduced energy consumption.
When measuring wattage, it is important to look at the entire lighting fixture and not just the bulb. Fluorescent and high intensity discharge (HID) fixtures have ballasts, which also use power. The wattage value you should consider is system wattage, which accounts for the watts used by the bulb, the ballast, and any other component within the luminaire. For instance, an HID 400w metal halide (MH) high bay will use 400 watts for the bulb and usually about 58 watts for the ballast, for a total of 458 watts.
Lumens
Different fixtures produce different amounts of light. The quantity of light is measured in lumens, which indicates how much light a fixture produces. Watts for the lamp and lumen ratings are specified on the packing of the lamps. As some fixtures are more efficient than others, some will produce more lumens per watt than others. In some types of technology, the ballast can seriously affect lumen output.
Different types of light bulbs produce varying lumens, with comparisons often made to traditional incandescent bulbs, such as a 60-watt bulb, to help consumers understand the brightness levels.
The data is further complicated when you consider the difference between light source lumens and delivered lumens. Light source lumens are the lumens emitted by the lamp or array itself. Delivered lumens, however, is the measure of the lumens that actually leave the fixture. The latter is most relevant, as it accounts for light lost when passing through the glass/lens and through reflection. Some lamps are also more efficient than others, which means both their light source lumens and delivered lumens will be higher, even if the wattage is the same as other lamps. Lumens quantify the visible light emitted by a light source, making it crucial to understand the correct measurement of lumens to assess lighting effectiveness.
Lumens per Watt
Comparing lumens per watt (LPW) for different fixtures is crucial to determine their efficiency. Fixtures with high LPW can be considered more efficient than other fixtures.
A comparison between incandescent and fluorescent fixtures shows that incandescent fixtures generate about 17–20 LPW, while some fluorescent fixtures put out over 90 LPW. This means the fluorescent fixture costs about 80% less to operate, yet puts out the same number of lumens. The more efficient the fixture is, the lower the operating cost. Fixtures with high LPW are more environmentally friendly, too.
Lumens per watt is a reliable way to measure fixture efficiency. LPW is easily calculated by dividing lamp lumens by total wattage. Fluorescent and HID fixtures suffer significant lumen depreciation. This means that as the lamps age, the HID lamps emit fewer and fewer lumens. LEDs also experience lumen depreciation, but it isn’t nearly as severe as that of fluorescent and HID. To account for lumen depreciation, most manufacturers have data on initial lumens and mean lumens. Lumens per watt is a unit of measurement for fixture efficiency.
Most labels will only use initial lumens, as it is the most attractive data point. The mean lumen rating may only be available in the lamp manufacturer’s catalog. You can also speak to a lighting specialist at Access Fixtures for more information.
LED Lighting Benefits
LED (Light Emitting Diode) lighting has revolutionized the way we think about lighting. LED bulbs are energy-efficient, using significantly less power than traditional incandescent bulbs to produce the same amount of light. This not only saves you money on your electricity bills but also reduces your carbon footprint. Additionally, LED bulbs have a longer lifespan, lasting up to 25 times longer than incandescent bulbs. This means less waste and fewer replacements, making them a smart choice for consumers. With their high lumen output and low energy consumption, LED bulbs are the perfect solution for those looking to brighten up their space while being kind to the environment.
Lighting Facts and Labels
When shopping for light bulbs, it’s essential to understand the labeling and terminology used. The Lighting Facts label is a valuable resource that provides information on a bulb’s energy efficiency, lumen output, and color temperature. This label helps consumers compare different bulbs and make informed decisions. The label includes details such as the number of lumens, watts, and the color temperature of the bulb. By understanding what these terms mean, you can choose the right bulb for your needs. For example, if you’re looking for a bulb with a high lumen output, you’ll want to look for a bulb with a high number of lumens. Similarly, if you’re concerned about energy consumption, you’ll want to choose a bulb with low wattage.
Choosing the Right LED Bulb
With so many options available, choosing the right LED bulb can be overwhelming. However, by considering a few key factors, you can make an informed decision. First, think about the amount of light you need. If you’re looking to replace a traditional 60-watt bulb, you’ll want to look for an LED bulb with a similar lumen output (around 800 lumens). Next, consider the color temperature of the bulb. Warm white bulbs (2700K-3000K) are ideal for living spaces, while cool white bulbs (3500K-5000K) are better suited for task-oriented areas. Finally, think about energy efficiency and look for bulbs with low wattage and high lumens per watt. By considering these factors, you can find the perfect LED bulb for your needs.
Regulation
Many states have regulations that limit the watts used per square foot. Requirements vary from state to state and sometimes on whether a project is a new install or a renovation. Be sure to check if your project is regulated and, if so, the energy-usage limits for your purpose and location. Additionally, understanding the importance of voltage in light output and efficiency is crucial, especially when transitioning to energy-efficient alternatives like LEDs.
Access Fixtures is your factory-direct source for all light fixtures needed to suitably illuminate your property. If you have a lighting question, we will be glad to answer your questions. We want to make sure you get the exact fixture for your needs, your budget, and your goals. Utilizing a watts conversion chart can help you select the right LED bulbs based on their brightness measured in lumens, ensuring you choose the most energy-efficient lighting options. We are passionate about lighting and love what we do—we’ll get you an answer. To speak with an Access Fixtures lighting specialist, call (800) 468-9925.
Conclusion
In conclusion, understanding lighting is key to making informed decisions about your lighting needs. By grasping concepts such as lumens, watts, and LED technology, you can choose the right light bulb for your space. Remember to look for the Lighting Facts label and consider factors such as light output, energy consumption, and color temperature. For more information on lighting and energy efficiency, visit the U.S. Department of Energy’s website (energy.gov) or consult with a lighting professional. With the right knowledge and resources, you can create a brighter, more energy-efficient space that meets your needs and enhances your quality of life. Whether you’re looking to replace traditional incandescent bulbs or upgrade to smart lighting solutions, the world of lighting has never been brighter.
