Incandescent Lamp Styles, Wattages & Lumens
Incandescent Lamp Styles
Incandescent lamps have historically been available in a great variety of shapes, sizes, wattages, lumen outputs, and envelope colors. Following is a representative sampling of some key varieties.
Crenshaw specs may be used in every case as a reference for selecting the appropriate LED or CFL replacement. Consumer packaging should indicate both the incandescent equivalent wattage, base type, and the usage suitability (eg., for exterior wet location, etc.). Crenshaw recommends testing LED and CFL replacement lamps wherever possible before purchasing as lamping effects such as shadowing and hotspots can vary widely across manufacturer models.
LED & CFL Replacement Lamps
LED & CFL replacement lamps vary widely in performance, features, and sizes. Crenshaw does not endorse any particular brand or style. However, we recommend purchasing only UL listed lamps.
Occasional use areas which require instant-on lighting such as bathrooms, hallways, exterior pathways, and bedrooms may benefit from LED replacement lamping, as CFL replacement lamps tend to take time to warm up to full brightness, especially in cold weather. For fully enclosed fixtures such as exterior post lanterns, outdoor sconces, and ceiling fixtures, using lamps explicitly rated for fully enclosed fixtures will ensure full lamp life and warranty coverage. If dimming is expected, be sure to select dimmable lamps, as not all LED and CFL replacement lamps are dimming capable.
Wattages & Lumens
Reference outputs for traditional incandescent lamps are averages — actual performance specifications have historically varied per manufacturer and lamp type. Specs and availability for LED replacement lamps are typical based on market availability — some change and variation should be expected as the technology emerges.
|A19||25||220||3-4W/ 200-300 lum||medium screwbase (E26)|
|A19||40||475||6-8W/ 450-600 lum||medium screwbase (E26)|
|A19||60||850||9.5-13W/ 800-950 lum||medium screwbase (E26)|
|A19||75||1200||13-17W/ 1000-1200 lum (A19/A21)||medium screwbase (E26)|
|A19||100||1600||(A21 only)||medium screwbase (E26)|
|A21||100||1100||16-22W/ 1600-1800||medium screwbase (E26)|
|A21||150||2500||not avail (2015)||medium screwbase (E26)|
|A21||200||3000||not avail (2015)||medium screwbase (E26)|
|B/CA||25||150||3-4W/ 200 lum||candelabra screwbase (E12)|
|B/CA||40||300||4.5-6W/ 250-350 lum||candelabra screwbase (E12)|
|B/CA||60||550||6-7W/ 550-600 lum||candelabra screwbase (E12)|
|BR40||65||650||10-11W/ 650-700 lum||medium screwbase (E26)|
|BR40||120||1300||13-18W/ 900-1300 lum||medium screwbase (E26)|
|BR40||300||2500||not avail (2015)||medium screwbase (E26)|
|G25||25||220||limited avail||medium screwbase (E26)|
|G25||40||420||5-8 W/ 325-500 lum||medium screwbase (E26)|
|G25||60||700||7-10W/ 500-660 lum||medium screwbase (E26)|
|G25||100||1200||not avail (2015)||medium screwbase (E26)|
|G40||40||350||limited avail||medium screwbase (E26)|
|G40||60||600||8W/ 500 lum||medium screwbase (E26)|
|G40||100||1000||15W/ 900 lum||medium screwbase (E26)|
|PAR38||250||3000||not avail, max 1600 lum (2015)||medium screwbase (E26)|
|R20||75||575||10W/ 700 lum||medium screwbase (E26)|
|R20||100||1000||not avail (2015)||medium screwbase (E26)|
|R40||300||2500||not avail (2015)||medium screwbase (E26)|
|R40||300||3000||not avail (2015)||mogul screwbase (E39)|
|R40||500||5000||not avail (2015)||mogul screwbase (E39)|
|T8||25||220||limited avail||candelabra screwbase (E12)|
|T10||40||425||limited avail||medium screwbase (E26)|
|T10||60||650||limited avail||medium screwbase (E26)|
High-bay LED replacement lamps are available. These range in output from 3,000 – 15,000 lumens and use medium base (E26) and mogul base (E39) sockets. CRI tends to drop below 80 at the higher lumen outputs, and lamp costs are high as of 2015. Although these lamps are generally too large for use in decorative lighting (typically 7-9″ in diameter x 8-10″ high), and not specifically engineered for aesthetic light quality, unique applications may exist.
Color Temperature (CCT)
While color temperature has been consistent among the vast majority of incandescent and halogen lamps, it varies widely among LED and CFL replacement lamps, and represents a new variable to consider when selecting replacement lamping. Color temperature is used in lighting to describe the hue of a white light source, and is typically defined in degrees Kelvin. In practical terms, warm white light, most often used in residential and commercial settings where relaxed ambient lighting is desired, is normally defined by color temperatures in the 2400-2700K range. Traditional incandescent lamping typically falls within this color temperature range and is known for it’s yellowish hue. Halogen, which exhibits a color closer to true white, measures around 3000K. As contemporary lighting design has leaned toward clean, bright lighting plans, 3000K-3500K has become the new standard in decorative lighting. Often described as warm white in the industry, these lack the yellowish hue of 2700K. 4100K is usually defined as cool white, and most often seen in commercial or workspace applications where productivity and alertness are desired. 5000K-6000K are described as cold white and most often employed in utility applications. They have a bluish cast, and are typically associated with high output, long life lamp sources.
Color Rendering (CRI)
While incandescent and halogen lamps are generally measured at near perfect color rendering (close to 100 CRI), among LED and CFL replacement lamps color rendering varies. Color rendering refers to the ability of a light source to illuminate an object’s true color, and is independent of color temperature. Sunlight color rendering is the reference standard, and as can be observed, spans the spectrum from extremely warm (1800K at sunset) to extremely cool (8000K in deep shade). All other light sources are ranked in comparison along a scale which measures 100 CRI as perfect color rendering. Some fluorescent lamps perform below 70 CRI. Certain long-life utility lamping such as high-pressure sodium can exhibit CRI’s below 30. This effect can be seen most readily in greenish skin hues under low-quality fluorescent lighting, or the loss of color differentiation under some utility lighting. Artists, photographers, product display designers, and museum curators are all acutely aware of the importance of color rendering.
The standard color rendering scale, which most published CRI specifications reference, measures only a selection of colors. Other more exacting scales add ranges of the color spectrum for a more complete picture of light quality. Leaders in museum LED lighting technology such as Xicato are working closely with this aspect of color rendering performance.