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. 711-7206
Mfr. Part No.25003
BrandSylvania
TWD226.60
Each (In a Pack of 10)
units
2D 38 W GR10q 207 mm 3500K - Warm White 82 835 205mm 1 2850 lm 10000h A
RS Stock No. 407-5581
Mfr. Part No.7PLS8402PINB
TWD167.00
Each
units
Twin Tube 7 W G23 135 mm 4000K 40W Cool White 82 840 28mm 1 400 lm 10000h B
RS Stock No. 570-650
Mfr. Part No.11PLS8272PINB
TWD162.00
Each
units
Twin Tube 11 W G23 236 mm 2700K 75W Warm White 82 827 28mm 1 900 lm 10000h A
RS Stock No. 711-7209
Mfr. Part No.25004
BrandSylvania
TWD212.60
Each (In a Pack of 10)
units
2D 38 W GR10q 207 mm 4000K - Cool White 82 840 205mm 1 2850 lm 10000h A
RS Stock No. 570-723
Mfr. Part No.18PLC8272PIN
TWD215.00
Each
units
2D 18 W G24d-2 150 mm 2700K 100W Warm White 82 827 27mm 2 1200 lm 10000h B
RS Stock No. 570-638
Mfr. Part No.7PLS8272PINB
TWD162.00
Each
units
Twin Tube 7 W G23 135 mm 2700K 40W Warm White 82 827 28mm 1 400 lm 10000h B
RS Stock No. 570-600
Mfr. Part No.36PLL840
TWD276.00
Each
units
Twin Tube 36 W 2G11 417 mm 4000K 240W Cool White 82 840 38mm 1 2900 lm 20000h A
RS Stock No. 702-5419
Mfr. Part No.28PLQ8274PIN
TWD208.40
Each (In a Pack of 10)
units
2D 28 W GR10q 207 mm 2700K 28W Warm White 82 827 205mm 1 2050 lm 12000h B
RS Stock No. 702-5422
Mfr. Part No.38PLQ8404PIN
TWD347.80
Each (In a Pack of 10)
units
2D 38 W GR10q 207 mm 4000K 38W Cool White 82 840 205mm 1 2850 lm 12000h B
RS Stock No. 407-5648
Mfr. Part No.26PLC8402PIN
TWD140.00
Each
units
Quad Tube 26 W G24d-3 171 mm 4000K 150W Cool White 82 840 27mm 2 1800 lm 10000h B
RS Stock No. 711-7180
Mfr. Part No.24991
BrandSylvania
TWD121.50
Each (In a Pack of 10)
units
2D 16 W GR10q 141 mm 3500K - Warm White 82 835 138mm 1 1050 lm 10000h A
RS Stock No. 702-5315
Mfr. Part No.10PLC8302PIN
TWD140.00
Each
units
2D 10 W G24d-1 116 mm 3000K 60W Warm White 82 830 27mm 2 600 lm 10000h B
RS Stock No. 786-3325
Mfr. Part No.41168
BrandGE
TWD185.00
Each
units
U Tube 36 W 2G11 422 mm 3000K - Warm White 82 830 44mm 1 2900 lm 10000h A+
RS Stock No. 820-8808
Mfr. Part No.009314
BrandOrbitec
TWD339.00
Each
units
Oval 9 W B22d 100 mm 2700K 40W - - - 50mm - - - A
RS Stock No. 711-7265
Mfr. Part No.25913
BrandSylvania
TWD99.40
Each (In a Pack of 10)
units
Stick 13 W G24d-1 141 mm 4000K - Cool White 82 840 28mm 1 900 lm 10000h A
RS Stock No. 792-6823
Mfr. Part No.4050300010793
BrandOsram
TWD239.00
Each
units
Quad Tube 36 W 2G11 411 mm 3000K - Warm White 89 830 17.5mm 2 2900 lm 20000h A
RS Stock No. 792-6748
Mfr. Part No.4052899912564
BrandOsram
TWD217.00
Each
units
Quad Tube 11 W E27 96 mm 4000K 55W Cool White 80 840 41mm - 660 lm 10000h A
RS Stock No. 765-3402
Mfr. Part No.0025889
BrandSylvania
TWD82.40
Each (In a Pack of 10)
units
U Tube 7 W G23 138 mm 4000K - Cool White 82 840 34mm 1 425 lm 10000h A
RS Stock No. 711-7287
Mfr. Part No.25925
BrandSylvania
TWD84.80
Each (In a Pack of 10)
units
Stick 13 W G24q-1 118 mm 4000K - Cool White 82 840 28mm 1 900 lm 10000h A
RS Stock No. 792-6839
Mfr. Part No.4050300295879
BrandOsram
TWD243.00
Each
units
Quad Tube 55 W 2G11 535 mm 4000K - Cool White 89 840 18mm 2 4800 lm 20000h A+