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. 829-3483
BrandRS PRO
£6.47
Each
Units
U Tube 13 W - - - - - - - - - - - B
RS Stock No. 407-5597
Mfr. Part No.9PLS8402PINB
£3.92
Each
Units
Twin Tube 9 W G23 167 mm 4000K 60W Cool White 82 840 28mm 1 600 lm 10000h A
RS Stock No. 463-5919
Mfr. Part No.4050300010786
BrandOsram
£5.831
Each (In a Pack of 10)
Units
Twin Tube 36 W 2G11 415 mm 4000K 240W Cool White 80 840 38mm 1 2900 lm 10000h A
RS Stock No. 792-6839
Mfr. Part No.4050300295879
BrandOsram
£5.70
Each
Units
Quad Tube 55 W 2G11 535 mm 4000K - Cool White 89 840 18mm 2 4800 lm 20000h A+
RS Stock No. 711-7192
Mfr. Part No.24999
BrandSylvania
£34.96
1 Pack of 10
Pack(s)
2D 28 W GR10q 207 mm 3500K - Warm White 82 835 205mm 1 2050 lm 10000h A
RS Stock No. 792-6782
Mfr. Part No.4050300425627
BrandOsram
£7.05
Each
Units
Triple Tube 42 W GX24q 169 mm 4000K - Cool White 89 840 49mm 2 3200 lm 20000h A
RS Stock No. 472-7721
Mfr. Part No.DDE264
BrandOsram
£33.50
1 Pack of 10
Pack(s)
Quad Tube 26 W G24q-3 165 mm 4000K 150W Cool White 80 840 27mm 2 1800 lm 20000h A
RS Stock No. 407-5698
Mfr. Part No.26PLC8404PIN
£4.60
Each
Units
Quad Tube 26 W G24q-3 164 mm 4000K 150W Cool White 82 840 27mm 2 1800 lm 13000h A
RS Stock No. 472-7715
Mfr. Part No.DDE184
BrandOsram
£3.357
Each (In a Pack of 10)
Units
Quad Tube 18 W G24q-2 146 mm 4000K 100W Cool White 80 840 27mm 2 1200 lm 20000h A
RS Stock No. 792-6849
Mfr. Part No.4050300816838
BrandOsram
£6.41
Each
Units
Twin Tube 16 W GR8 141 mm 3500K - Warm White 89 835 138mm 4 1050 lm 10000h B
RS Stock No. 407-5604
Mfr. Part No.11PLS8402PINB
£3.96
Each
Units
Twin Tube 11 W G23 236 mm 4000K 75W Cool White 82 840 28mm 1 900 lm 10000h A
RS Stock No. 463-5896
Mfr. Part No.DL1884
BrandOsram
£49.44
1 Pack of 10
Pack(s)
Twin Tube 18 W 2G11 225 mm 4000K 100W Cool White 80 840 38mm 1 1200 lm 10000h A
RS Stock No. 792-6772
Mfr. Part No.4050300342283
BrandOsram
£7.05
Each
Units
Triple Tube 26 W GX24q 132 mm 4000K - Cool White 89 840 49mm 2 1800 lm 20000h A
RS Stock No. 570-587
Mfr. Part No.18PLL840
£5.90
Each
Units
Twin Tube 18 W 2G11 227 mm 4000K 100W Cool White 82 840 38mm 1 1200 lm 20000h A
RS Stock No. 792-6827
Mfr. Part No.4050300279909
BrandOsram
£5.70
Each
Units
Quad Tube 40 W 2G11 533 mm 4000K - Cool White 89 840 18mm 2 3500 lm 20000h A+
RS Stock No. 570-600
Mfr. Part No.36PLL840
£6.49
Each
Units
Twin Tube 36 W 2G11 417 mm 4000K 240W Cool White 82 840 38mm 1 2900 lm 20000h A
RS Stock No. 570-694
Mfr. Part No.11PLS8274PINB
£3.82
Each
Units
Twin Tube 11 W 2G7 220 mm 2700K 75W Warm White 82 827 28mm 1 900 lm 13000h A
RS Stock No. 791-8321
Mfr. Part No.0035012
BrandSylvania
£2.91
Each
Units
Stick 11 W B22 118.5 mm 2700K 48W - 80 827 42mm - 560 lm 8000h A
RS Stock No. 792-6842
Mfr. Part No.4050300299037
BrandOsram
£14.67
Each
Units
Quad Tube 36 W 2G10 217 mm 4000K - Cool White 89 840 18mm 2 2800 lm 10000h A
RS Stock No. 540-482
Mfr. Part No.927939384040
£6.568
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