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The LED Authority

100W Equivalent, 23 Watt, 120 Volt Dimmable Warm White Spiral CFL Bulb. (Pack of 2)

SKU: ULA000149 | Ordering Code: SDS23-2P (Dimmable)

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Product Highlights

  • Estimated life of 7.3 years based on 3 hours use per day

Lighting Facts Per Bulb

Brightness 1600 lumens
Estimated Yearly Energy Cost $2.77
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day7.3 years
Light Appearance
2800 K
Energy Used23 watts

U Lighting brand ENERGY STAR Qualified 23 Watt compact fluorescent lamp. DIMMABLE. Warm white color and high color rendering mean you'll never know the difference, at least until you get your electric bill.

  • Outstanding energy efficiency - provides equivalent light to many 100 Watt incandescent lamps while using only 23 Watts of electricity

  • Outstanding life - 8,000 hour rated life is four to eight times as long as most incandescent lamps

  • Outstanding value - replace your existing lamps with more energy efficient technology, at a competitive price

NOT RECOMMENDED for use in enclosed fixtures, may shorten lamp life. SEE ADDITIONAL INFORMATION SECTION for Dimming Performance Information.

2 Pack (multi-pack priced per bulb)

Full Specs


U Lighting America

Energy Used

A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.
Energy Used
23 Watts


A measure of "electrical pressure" between two points. The voltage specification of an incandescent lamp is the electrical "pressure" required to drive it at its designed point. The "voltage" of a ballast (e.g. 120 V) refers to the line voltage coming from the power source and is connected to the ballast.


The end (or ends) of the lamp that fits into the socket.
Medium (E26)

Bulb Shape

The description of the general appearance of a lamp/bulb consists of a letter(s) followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. For example, a common household bulb is the A-19. The bulb is "A" shape and the diameter would be nineteen 8ths of an inch, or 2 3/8".
Bulb Shape

Bulb Color

The color of the light produced by a bulb
Bulb Color
Warm White


Color Rendering Index is an international system used to rate a lamp's ability to render object colors. The higher the CRI (based upon a 0-100 scale) the richer and more accurately colors generally appear. CRI differences among lamps are not usually visible to the eye unless the difference is more than 3-5 points.

Color Temperature (Kelvin)

An expression of the hue of the light emitted, measured in degrees Kelvin. Usually expressed by a four digit number followed by (k), such as 2700k. Higher temperatures indicate whiter, "cooler" colors, while lower temperatures indicate yellower, "warmer" colors. Some common Kelvin temperature benchmarks are 2700k (warm white), 3500k (neutral white), 4100k (cool white), 5000k (bright white), and 6500k (daylight).
Color Temperature (Kelvin)

Brightness (Lumens)

A rating of the initial light output of a bulb, rated after 100 hrs of operation. Lumens are a measure of how much light falls on one square foot of area, one foot away from the light source.
Brightness (Lumens)

Bulb Finish

The surface finish of a bulb, which may affect the quality of the light emitted.
Bulb Finish

Bulb Technology

The technology implemented by the bulb, e.g. incandescent, halogen, LED
Bulb Technology

Average Rated Life (hr)

A measurement of the average length of time, between first use and the point when 50% of the lamps tested have stopped functioning, , using an operating cycle of 3 hours on, 20 minutes off.
Average Rated Life (hr)

Length (in)

Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
Length (in)

Diameter (in)

Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.
Diameter (in)


ENERGY STAR is a program created jointly by the U.S, Environmental Protection Agency and the U.S. Department of Energy to help people save money and protect the environment by using energy-efficient electronics and appliances. ENERGY STAR-certified devices use less energy without compromising functionality.


Indicates whether a bulb can be dimmed in conjunction with a suitable dimmer control.

Contains Mercury (Hg)

Contains some level of the element Mercury. Typically, bulbs containing Mercury display the symbol 'Hg'.
Contains Mercury (Hg)

Product Notes: Please Test Small Quantities Before Investing in a Large Purchase. No Dimmable CFL Product Performs Like Traditional Incandescent or Halogen Bulbs. Dimmable CFL Bulbs May Not Work Well With Your Dimmer Switch and Even Those That Are Compatible Produce Noticeable Dimming Only Between 20-50% of Total Output. Traditional Bulbs Typically Dim from 0-100%, Dimmable CFL's Do Not. ALSO, NO OTHER/NO ADDITIONAL DISCOUNT OFFERS APPLY.

Customers Also Viewed
Customer Reviews

Hums...doesn't get very dim


Tried to use these in two pendant lamps above our kitchen island/bar. The bulbs are long, so they extended past the bottom edge of the fixture glass. Very bright light, and despite the description these did not seem to emit a "warm" they were uncomfortably glaring to sit near. When dimmed, they hum loud enough to be distracting to conversation. And when dimmed to lowest level, they just aren't that dim. All in all they aren't usable in this application.




Bulbs do not last


I installed 10 of these in my office about a year ago. Since then 7 of them have burned out.




Bulbs did not last 1 year


Used for just under 1 year in a household dimmable fixture. 2 bulbs burnt out about the same time. Not a durable product.


Seattle, WA




Had ordered two sets(4 bulbs) and one set came all in pieces but the other was intact.


Rio Rancho NM


Dims Well, Cost Effective


This is a replacement for a 100W living room table lamp. At only 23W at full brightness, it's a good choice. It dims well with my INSTEON dimming system for day-to-day use, but puts out good brightness when that's needed.

Dave Marsh

Sacramento, CA


Burned out quickly


[...]bulbs were replaced, but they burned out rapidly


Milwaukee, WI


100W Equivalent, 23 Watt, 120 Volt Dimmable Warm White Spiral CFL Bulb.

2.8 6


Q & A
Can these be used in three-way light fixtures? I have three lamps that use three-way bulbs and I've been wanting to switch them to low voltage bulbs or if possible to LED light bulbs.

This bulb should not be used in a three-way fixture. We do offer three-way CFL's on our website and they can be found using the following link. Spiral&Nty=1

Product Support