Today's Offers
Today's OffersHide
15% off all Lunera products. Use promo code LUNERA15 at checkout.
New low prices on brand bulbs
Get a free Monkey fan with this BloomBoss kit. Use promo code MONKEY at checkout.
FREE SHIPPING on orders over $99

Speak with a lighting specialist


Weekdays 8am-7pm EST
243 Stafford St.
Worcester, MA 01603
Tel. 1 (888) 455-2800
Fax 1.508.363.2900

The LED Authority

Philips 18W 4 Pin 2G11 Cool White Long Single Twin Tube CFL Bulb

SKU: 345017 | Ordering Code: PL-L 18W/41 (4-Pin)  | UPC: 046677345013

$5.99 per Bulb
Add to Cart
Save to BulbTrack ?

My BulbTrack

Finding the lighting solutions you need might be simple at, but buying them is even easier. Thanks to our exclusive BulbTrack feature, you can quickly and easily order the products you have purchased in the past or plan to order in the future by simply adding them to your My BulbTrack page. Products are added to your My BulbTrack page when you check out from your shopping cart or add them from the product description pages.

Once a product has been added to My BulbTrack, ordering it is as easy as entering the quantity or clicking on the product image. You can even add notes to each product to record where it is used in your business or home. Make buying your replacement lighting as simple as it should be. Create your BulbTrack today!

In Stock

Order within the next 7 hours 58 minutes to ship today

Free ground shipping on orders over $99*

Product Highlights

  • Estimated life of 9.1 years based on 3 hours use per day

Lighting Facts Per Bulb

Brightness 1250 lumens
Estimated Yearly Energy Cost $2.17
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day9.1 years
Light Appearance
4100 K
Energy Used18 watts

Philips brand 18 Watt plug-in compact fluorescent bulb with 2G11 base.  ALTO technology uses less mercury for an environmentally safer lamp.

  • Cool white color very popular with most businesses

  • Performance - well known brand name product at competitive price

Full Specs


Philips Lighting

Product Line


Model Number

PL-L 18W/41

Energy Used

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


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

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
Single Twin Tube

Bulb Color

The color of the light produced by a bulb
Bulb Color
Cool 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)

Contains Mercury (Hg)

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


A General Electric brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
17176 - F18BX/SPX/41

Osram Sylvania

An Osram Sylvania brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
Osram Sylvania
20589 - FT18DL/841
Customers Also Viewed
Customer Reviews

Specialized Lamp 18W 4 Pin Bulb


Hard to find specialized 8W 4 Pin Bulb for older desk lamp fit/works. As described and should last for years as original.

Big Spender

Quincy, MA


satisfied since buying this product


machine shop


san fernando, ca 91340


Great product so far


Works great on my desk lamp.




Just Right


Replacement bulb for a desk lamp

KD on Sunflower



Esxceeded my expectation


Almost discarded a stainless steel desk lamp because I could not find replacement bulb locally. Accurate description on gave me confidence to order and bulb was exactly right . Light emitted is superior to the one that came with lamp. Delivery was prompt and item well packed for protection.


Morristown NJ


new bulb is working great


the bulb is on the inside of a cnc machine

qc manager

danvers MA


good service poor ordering by me


I bought the wrong product. When I saw yuour add it stated that the item had a 4 prong connection, I thought there was only one type but there was 2. You only had the 4 prong horizontal connection and I needed the four prong square connection. As far as I can determine the item I need is no longer manufactured and therefore I will get the lamp rewired to accomodate the item you sent me. I am thoroughly satified with your service and would both use it again and recommend it to anyone looking for lamp bulbs.


long island NY


I got what I needed! Thanks!


I couldnt find the bulb at the store but I found it at Thanks!!!


Dallas, TX


Philips 18W 4 Pin 2G11 Cool White Long Single Twin Tube CFL Bulb

4.8 8


Q & A
I recently purchased a Normandy model HP3-1384 desk top crafter's lamp, which did not have a bulb. A label on the lamp says to use an 18 watt, 120V type PL bulb and it requires a four prong bulb and the space is large enough to accommodate a twin bulb of approximately 9 inches long. I'm trying to determine if this bulb will work.

Bob L

There is not much information to be found on the lamp. This makes it difficult to determine if this bulb would be suitable. This bulb is a plug-in compact fluorescent, 18 watts and is less than 9" in length. The only real question is the base type needed. We recommend checking the socket to check the pin configuration. If the pin configuration of the socket is a straight row, then this bulb would be correct to use in the lamp.

Product Support