In this video, we’re going to cover some essential lightning lingo. Light bulbs usually have a lightning facts label that gives you all the details of the product, similar to nutrition labels on food.
Wattage: energy consumption
Wattage is a measure of power. For instance, a 40-watt bulb uses 40 joules per second. However, LED bulbs are more energy-efficient; a 5.5-watt LED bulb can provide the same brightness as a conventional 40-watt bulb while using significantly less power. Another example is a flood bulb using only 23 watts to match the brightness of a traditional 120-watt bulb.
Lumens: measure of brightness
Lumens represent the brightness or visible light emitted by a bulb. A higher lumen number indicates a brighter light. A small bulb may give off only 460 lumens, while a large flood light emits 1750 lumens. LED lights can produce more lumens with lower wattage, making them brighter and more energy-efficient. The lumens value is often listed on the lighting facts label at the back of the packaging.
Lumens per Watt: measuring efficiency
Lumens per watt, or efficacy, is calculated by dividing the total light output by the total power input. A candelabra bulb with 515 lumens and 5 watts has an efficacy of 103 lumens per watt. Higher efficacy ratings translate to lower operating costs.
Estimated Yearly Energy Cost
The estimated yearly energy cost is based on three hours of daily usage and an 11-cent per kilowatt-hour rate. For instance, a small bulb would cost around $0.66 per year, while a flood bulb would cost approximately $2.77. However, local electricity rates may vary, so it’s advisable to check for accuracy.
Life Hours: Bulb Longevity
Life hours indicate the average lifespan of a bulb, determined through engineering testing and probability analysis. Traditional 40-watt incandescent bulbs typically have 1,500 life hours, whereas equivalent CFL bulbs offer 10,000 life hours, and equivalent LED bulbs provide around 25,000 life hours. However, the actual lifespan may vary depending on the quality of the bulbs.
Color Temperature: Setting the Mood
Color temperature is expressed in Kelvin, ranging from warm candlelight (2000 Kelvin) to a blue sky (10000 Kelvin). Different color temperatures create various ambiances:
- 2700 Kelvin is a yellow, warm, calming and inviting light given off by incandescent and high pressure sodium bulbs. It’s used in homes and restaurants.
- 3500K is a cool white light given off by halogen bulbs. It’s used in offices, receptions, and supermarkets.
- 4800K is the color temperature of direct sunlight.
- 5000K is a crisp, cool blue-ish daylight. It’s used in garages, security lighting, jewelry display cases and warehouses.
Color Rendering Index (CRI): Evaluating Color Accuracy
CRI measures the effect of a light source on the color appearance of illuminated objects, ranging from 1 to 100, with 100 being the most accurate. Incandescent bulbs typically have a CRI of 100 and LED bulbs can have CRI ratings between 65 and 90. Higher CRI values indicate better color accuracy.
Energy Star Certification and Title CA20
All CREE light bulbs boast Energy Star certification, meeting stringent energy efficiency guidelines set by the US Environmental Protection Agency. They use 90% less energy than standard bulbs, last significantly longer, and save on electricity costs, reducing greenhouse gas emissions.
Dimmable and Enclosed Use Bulbs
Most incandescent and halogen bulbs work with almost all dimmer switches and can be dimmed completely. While CREE LED bulbs are dimmable, not all LEDs or fluorescent bulbs offer this feature. Enclosed use labeling indicates whether a bulb can be used in enclosures without proper airflow or ventilation. LED bulbs may experience a reduced lifespan if overheated in enclosed spaces.
Indoor and Outdoor Use
An indoor and outdoor label means the bulb is suitable for both settings and can handle damp or wet conditions. For example, CREE bulbs can be used in damp locations like bathrooms but should not be directly exposed to weather or water outdoors.
Understanding Base and Bulb Sizes
Bulb bases come in various types, with the most common being the Edison Screw or ES base. Some examples include:
- Candelabra: E12 in North America, E11 in Europe
- Intermediate: E17 in North America, E14 (Small ES, SES) in Europe
- Medium or standard: E26 (MES) in North America, E27 (ES) in Europe
- Mogul: E39 in North America, E40 (Goliath ES) in Europe
Understanding these light bulb facts empowers you to make well-informed decisions when selecting the right lighting solutions for your needs.
