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Crompton Light Bulbs: Your essential buying guide
Check the code or shape on your existing bulb or light fitting first. Common UK fittings include bayonet caps such as B22 and screw caps such as E27 or E14, but specialist lamps may use pin, tube or capsule fittings. Matching the cap type and size is essential before comparing brightness or bulb technology.
Lumens are the best measure of brightness, while watts show how much power a bulb uses. When replacing older incandescent or halogen bulbs, look for the lumen output that gives a similar level of light, then compare the wattage, bulb type and colour temperature to suit the room.
Warm white bulbs are often chosen for living rooms, bedrooms and dining areas because they create a softer feel. Cool white or daylight bulbs can suit kitchens, utility rooms, garages, desks and task areas where a crisper light is useful. Always check the Kelvin rating if you want to match existing bulbs.
No. The bulb must be marked as dimmable, and it also needs to be compatible with your dimmer switch. This is especially important when switching from halogen or incandescent bulbs to LED lamps, as some older dimmers may not work smoothly with newer low-wattage bulbs.
LED lamps are a popular option for many household fittings, while halogen, fluorescent, xenon and incandescent bulbs may be needed for specific fixtures, effects or replacements. The right choice depends on your fitting, the brightness you need, the colour of light you prefer and whether the bulb must be dimmable.
Choosing light bulbs is easier when you start with the fitting and purpose of the light, then compare the bulb technology, brightness and colour. This guide explains the main details to check before you browse options on ShopSmarty.
Different light bulb technologies suit different fittings and uses. LED lamps are widely used for everyday home lighting, while fluorescent lamps are often found in tubes or compact task lighting. Halogen lamp bulbs, xenon lamps and incandescent lamp bulbs may be needed for certain older fittings, decorative fixtures or specialist applications.
If you are replacing a bulb, the quickest route is to match the existing bulb type, cap and shape. If you are changing to a different technology, check the fitting, voltage, dimmer compatibility and the physical size of the bulb before you compare options.
The cap fitting must match your lamp or ceiling fixture. Look for bayonet, screw, pin, tube or capsule fittings, and check the exact code where possible. A bulb that looks similar may still have a different cap size or pin spacing.
Shape and dimensions matter too. Candle bulbs, golf ball bulbs, GLS bulbs, spotlights, tubes and capsules all sit differently in a fitting. For enclosed shades, recessed downlights or compact lamps, measure the available space before choosing a replacement.
Brightness is measured in lumens, so use lumen output to compare how much light a bulb gives. Wattage is still useful, but mainly for understanding power use and checking the maximum rating allowed by your fitting.
For ambient lighting, you may want a softer output spread across several lamps. For reading, cooking, dressing tables or work areas, a brighter bulb or more focused beam may be more practical.
Colour temperature affects the mood and usefulness of a room. Warm white can help create a relaxed look, while cool white and daylight tones are often chosen where clearer task lighting is needed.
If a room uses several bulbs in one fitting, compare the Kelvin rating so the colour is consistent. Mixing different colour temperatures can make a chandelier, ceiling cluster or row of downlights look uneven.
If your light is on a dimmer switch, filter for dimmable bulbs and check that the bulb type suits the dimmer. Some LEDs require compatible dimmer modules, while many standard non-dimmable bulbs may flicker or fail to dim correctly.
For lamps with touch controls, timers or specialist transformers, the safest option is to check the fitting requirements before comparing replacements. This is particularly important for low-voltage halogen, xenon and capsule-style bulbs.
A hallway, bedside lamp, kitchen ceiling light and garage strip light can all need different bulbs. Consider how often the light is used, whether it needs instant brightness, how wide the beam should be and whether the bulb will be visible as part of the design.
For decorative fittings, appearance can be just as important as output. Clear, frosted, filament-style, candle and globe designs all create different effects, so compare the look of the bulb as well as the technical specification.
