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. 711-7281
Mfr. Part No.25926
BrandSylvania
HK$25.32
Each (In a Pack of 10)
units
Stick 18 W G24q-2 131 mm 4000K - Cool White 82 840 28mm 1 1200 lm 10000h A
RS Stock No. 791-8321
Mfr. Part No.0035012
BrandSylvania
HK$38.40
Each
units
Stick 11 W B22 118.5 mm 2700K 48W - 80 827 42mm - 560 lm 8000h A
RS Stock No. 711-7310
Mfr. Part No.27855
BrandSylvania
HK$31.898
Each (In a Pack of 10)
units
U Tube 26 W GX24q-3 131 mm 4000K - Cool White 80 840 49mm 3 1800 lm 15000h A
RS Stock No. 789-9790
Mfr. Part No.0025882
BrandSylvania
HK$29.08
Each
units
Stick 9 W G23 168 mm 2700K - Extra Warm White 80 827 33mm - 600 lm 10000h A
RS Stock No. 711-7379
Mfr. Part No.24997
BrandSylvania
HK$48.592
Each (In a Pack of 10)
units
2D 28 W GR10q 207 mm 2700K - Warm White 82 827 205mm 1 2050 lm 10000h A
RS Stock No. 848-7610
Mfr. Part No.25658
BrandSylvania
HK$57.17
Each (In a Pack of 10)
units
Twin Tube 36 W 2G11 417 mm 4000K - Cool White 82 840 - 1 2950 lm 16000h A
RS Stock No. 711-7278
Mfr. Part No.25915
BrandSylvania
HK$29.669
Each (In a Pack of 10)
units
Stick 26 W G24d-3 171 mm 4000K - Cool White 82 840 28mm 1 1800 lm 12000h A
RS Stock No. 765-3402
Mfr. Part No.0025889
BrandSylvania
HK$20.959
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. 711-7209
Mfr. Part No.25004
BrandSylvania
HK$57.17
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. 711-7366
Mfr. Part No.24946
BrandSylvania
HK$38.113
Each (In a Pack of 10)
units
2D 16 W GR8 141 mm 3500K - Warm White 82 835 138mm 1 1050 lm 10000h B
RS Stock No. 811-7730
Mfr. Part No.0025660
BrandSylvania
HK$42.983
Each (In a Pack of 10)
units
Twin Tube 55 W 2G11 540 mm 4000K - Cool White 82 840 - 1 4700 lm 20000h A
RS Stock No. 711-7269
Mfr. Part No.25914
BrandSylvania
HK$25.32
Each (In a Pack of 10)
units
Stick 18 W G24d-2 154 mm 4000K - Cool White 82 840 28mm 1 1200 lm 10000h A
RS Stock No. 711-7275
Mfr. Part No.25922
BrandSylvania
HK$25.32
Each (In a Pack of 10)
units
Stick 18 W G24q-2 131 mm 3000K - Warm White 82 830 28mm 1 1200 lm 10000h A
RS Stock No. 711-7196
Mfr. Part No.25000
BrandSylvania
HK$53.087
Each (In a Pack of 10)
units
2D 28 W GR10q 207 mm 4000K - Cool White 82 840 205mm 1 2050 lm 10000h A
RS Stock No. 765-3406
Mfr. Part No.0025891
BrandSylvania
HK$20.959
Each (In a Pack of 10)
units
U Tube 11 W G23 236 mm 4000K - Cool White 82 840 32.5mm 1 900 lm 10000h A
RS Stock No. 711-7287
Mfr. Part No.25925
BrandSylvania
HK$23.322
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. 711-7253
Mfr. Part No.25910
BrandSylvania
HK$25.32
Each (In a Pack of 10)
units
Stick 18 W G24d-2 90 mm 3000K - Warm White 82 830 28mm 1 1200 lm 10000h A
RS Stock No. 711-7259
Mfr. Part No.25909
BrandSylvania
HK$25.32
Each (In a Pack of 10)
units
Stick 13 W G24d-1 90 mm 3000K - Warm White 82 830 28mm 1 900 lm 10000h A
RS Stock No. 711-7192
Mfr. Part No.24999
BrandSylvania
HK$41.517
Each (In a Pack of 10)
units
2D 28 W GR10q 207 mm 3500K - Warm White 82 835 205mm 1 2050 lm 10000h A
RS Stock No. 811-7768
Mfr. Part No.0025659
BrandSylvania
HK$34.576
Each (In a Pack of 10)
units
Twin Tube 40 W 2G11 539 mm 4000K - Cool White 82 840 - 1 3500 lm 20000h A