CFL Bulbs

CFLs (Compact Fluorescent Lamps) are energy-saving bulbs consisting of a fluorescent tube that has been made into a shape the same size as a traditional incandescent light bulb.

How does a CFL work?

CFL Bulbs contain gases that are given an electric current, generating UV light which then excites the gasses. A phosphorous layer is then produced on the inside which glows, giving off light. There is very little heating involved.

What shape are CFLs?

Compact fluorescent light bulbs come in various shapes, such as:

  • Candle bulbs represent the shape of a flame, with a pointed tip, and are often used in decorative fixtures, especially slimmer designs that can't accommodate a globe or spiral bulb.
  • Globe bulbs are spherical shaped and are often used in vanity mirrors and bathroom pendants. They may take longer to reach full brightness but will become as bright as other CFLs.
  • Spiral bulbs have a fluorescent tube that is shaped into a spiral curve. This is the most common CFL bulb shape, producing the same amount of light as an incandescent bulb.
  • Stick or tube bulbs usually consist of multiple tubes which are straight. Like candle bulbs, they are commonly used in slimmer lighting fixtures.

What colour are CFL bulbs?

CFL light bulbs come in many variations of white. They are most commonly classed as "Cool White" or "Warm White", which describes the colour temperature of the light that the bulb emits. Colour temperature is a measurement of the light output, given in Kelvin (K). The higher the value, the cooler the white. For example, 5000K would be cool white lighting.

CFL Bases:

The base of the bulb depicts what fitting it pairs with. CFL lamps usually have a push and twist bayonet or Edison screw base, both of which are available in various sizes.

Why choose a CFL bulb?

Fluorescent bulbs are designed to be more energy-efficient than incandescent or halogen bulbs. They have a very low energy consumption which also saves money on electricity bills, over time. CFL bulbs have a much longer lifetime too, of up to approximately 10 years. The lifetime of the light bulb will be stated in hours.

What is CFL Equivalent Wattage?

Although CFLs do not use the same technology as incandescent bulbs, they are often given a comparable wattage value, providing an easy comparison to the equivalent wattage.


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Description Price Shape Wattage Lamp Base Length Colour Temperature Incandescent Equivalent Wattage Colour Tone Colour Rendering Colour Reference Diameter Number of loops Luminosity Life Hours EU Energy Efficiency Rating
RS Stock No. 407-5761
Mfr. Part No.55PLL840
kr 91,24
Each
Units
Twin Tube 55 W 2G11 542 mm 4000K 400W Cool White 82 840 38mm 1 4800 lm 20000h A
RS Stock No. 786-3325
Mfr. Part No.41168
BrandGE
kr 54,33
Each
Units
U Tube 36 W 2G11 422 mm 3000K - Warm White 82 830 44mm 1 2900 lm 10000h A+
RS Stock No. 780-6240
Mfr. Part No.41171
BrandGE
kr 65,204
Each (In a Pack of 25)
Units
Stick 40 W 2G11 539 mm 3000K - Warm White 82 830 44mm - 3500 lm 22500h A
RS Stock No. 792-6842
Mfr. Part No.4050300299037
BrandOsram
kr 190,12
Each
Units
Quad Tube 36 W 2G10 217 mm 4000K - Cool White 89 840 18mm 2 2800 lm 10000h A
RS Stock No. 463-6170
Mfr. Part No.DD2682
BrandOsram
kr 42,561
Each (In a Pack of 10)
Units
Quad Tube 26 W G24d-3 172 mm 2700K 150W Extra Warm White 80 827 27mm 2 1800 lm 10000h A
RS Stock No. 800-3735
Mfr. Part No.82174
BrandGE
kr 218,91
Each
Units
R80 23 W E27 130 mm 2700K 84W Warm White 80 827 83mm - 580 lm 15000h B
RS Stock No. 570-543
Mfr. Part No.18PLL830
kr 67,52
Each
Units
Twin Tube 18 W 2G11 227 mm 3000K 100W Warm White 82 830 38mm 1 1200 lm 20000h A
RS Stock No. 570-650
Mfr. Part No.11PLS8272PINB
kr 49,51
Each
Units
Twin Tube 11 W G23 236 mm 2700K 75W Warm White 82 827 28mm 1 900 lm 10000h A
RS Stock No. 540-482
Mfr. Part No.927939384040
kr 80,90
Each (In a Pack of 10)
Units
Quad Tube 28 W GR10q 207 mm 4000K 28W Cool White 82 840 205mm 1 2050 lm 12000h A
RS Stock No. 792-6791
Mfr. Part No.4050300025698
BrandOsram
kr 42,90
Each
Units
Quad Tube 13 W G24d-1 138 mm 3000K - Warm White 89 830 27mm 2 900 lm 10000h A
RS Stock No. 702-5330
Mfr. Part No.26PLC8304PIN
kr 32,40
Each
Units
2D 26 W G24q-3 164 mm 3000K 150W Warm White 82 830 27mm 2 1800 lm 13000h B
RS Stock No. 792-6779
Mfr. Part No.4050300342306
BrandOsram
kr 70,82
Each
Units
Triple Tube 26 W GX24q 132 mm 3000K - Warm White 89 830 49mm 2 1800 lm 20000h A
RS Stock No. 472-7973
Mfr. Part No.010625
BrandOsram
kr 43,377
Each (In a Pack of 10)
Units
Quad Tube 13 W G24d-1 138 mm 4000K 75W Cool White 80 840 27mm 2 900 lm 10000h A
RS Stock No. 711-7186
Mfr. Part No.24947
BrandSylvania
kr 58,662
Each (In a Pack of 10)
Units
2D 16 W GR8 141 mm 4000K - Cool White 82 840 138mm 1 1050 lm 10000h B
RS Stock No. 212-2455
Mfr. Part No.92246
BrandGE
kr 511,32
Each
Units
Genura 23 W E27 130 mm 3000K 100W Warm White 82 830 - - 1100 lm 15000h B
RS Stock No. 702-5387
Mfr. Part No.32PLT8304PINCS
kr 52,88
Each
Units
Six Tube 32 W GX24q-3 139 mm 3000K 180W Warm White 82 830 41mm 3 2400 lm 13000h B
RS Stock No. 820-8801
Mfr. Part No.009316
BrandOrbitec
kr 84,37
Each
Units
Oval 9 W B22d 100 mm 4000K 40W - - - 50mm - - - A
RS Stock No. 780-6230
Mfr. Part No.41298
BrandGE
kr 53,088
Each (In a Pack of 25)
Units
Stick 55 W 2G11 539 mm 4000K - Cool White 82 840 44mm - 4800 lm 22500h A
RS Stock No. 570-565
Mfr. Part No.36PLL830
kr 74,39
Each
Units
Twin Tube 36 W 2G11 417 mm 3000K 240W Warm White 82 830 38mm 1 2900 lm 20000h A
RS Stock No. 791-8321
Mfr. Part No.0035012
BrandSylvania
kr 38,47
Each
Units
Stick 11 W B22 118.5 mm 2700K 48W - 80 827 42mm - 560 lm 8000h A