A CFL bulb (compact fluorescent lamp) consists of a fluorescent coated glass tube filled with mercury vapour and gas. When electricity passes through the tube, invisible ultraviolet light is emitted, reacting with the fluorescent coating to produce visible white light.

E27 – an Edison screw, 27mm in diameter. Used in standard overhead light fittings (also referred to as an ES). There are some exceptions, with some bulbs being called for their bulb or their shape, rather than their cap width, such as G95 bulb. If the light bulb is the type that has pins, there may be a third letter to indicate how many pins it has. Smart light bulbs are LED light bulbs with in-built technology that allows them to be connected to and controlled by an app on a smartphone, tablet or speaker. Some connect to the smart device through WiFi, and some connect via Bluetooth. The user can turn the bulb on and off through the app or voice control and control schedules, brightness, and colour. E10 – an Edison screw, 10mm in diameter. Used in decorative lighting such as chandeliers (also referred to as an MES – miniature Edison screw).G4 – a multi-pin (or bi-pin) base with two pins 4mm apart. This is a small and compact bulb used in decorative light fittings. Modern light bulbs last longer too. Incandescent bulbs only last up to 1000 hours (approx. 6-9 months), while a halogen bulb lasts up to 2000 hours (approx. 1 year), a CFL bulb lasts up to 15,000 hours (approx. 10 years), and an LED bulb lasts up to 50,000 hours (approx. 25-30 years). Doesn’t work with old dimmer switches: an old dimmer switch might need to be upgraded to one that recognises low electrical loads. There are many benefits to having rechargeable light bulbs in the home, particularly if you live in an area that is prone to power outages. But choosing the right kind of bulb requires careful consideration, weighing up the cost, energy consumption, and how many lumens it supplies. An LED bulb is a low-wattage light bulb that gives off light using light-emitting diodes. This device emits light when electricity passes through it.

Modern light bulbs are more energy-efficient than old incandescent bulbs, especially LED bulbs. For example, LED bulbs use 90% less energy, CFL bulbs use 60-80% less energy, and halogen bulbs use 20-30% less energy than incandescent bulbs. Turning them on/off for short periods will shorten their life span: these bulbs should be left on or off for a minimum of 15 minutes to extend their life.

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Very energy efficient: they’re the most energy-efficient type of light bulb available, using up to 90% less energy than traditional incandescent bulbs and 80% less than halogen bulbs. Available for most light fittings: you can buy smart LED light bulbs for practically any type of light fitting.

Money-saving: they’re more expensive to buy, but they’re the cheapest option in the long term. The money saved on energy bills means they can pay for themselves within two months. To replace a 60W incandescent bulb in a living room, you'll need a 60 watt LED equivalent bulb of around 806lm, and its power will be 10W. Or, if the incandescent bulb is 100W, the equivalent LED bulb will be 1525lm and 18W. Beam angles are relevant to any type of directional light bulb, i.e., bulbs designed for spotlights and downlighters. Beam angles are an important factor when buying these types of bulbs because they tell you how wide the light beam will spread. For example, a low beam angle of around 25° works well in small rooms when multiple lights are fitted close together. Whereas wider beam angles work better in larger rooms. Convenient: they can be controlled remotely through a smartphone or by voice command through a smart speaker. This is very convenient because the user doesn’t even have to leave their seat to dim the lights or switch them off. E12 – an Edison screw, 12mm in diameter. Used in candelabras (also referred to as a CES – candelabra Edison screw).In contrast, the GE Lighting Rechargeable Light Bulb provides 760 lumens of brightness and emits a soft white glow. It lasts for up to five hours during a power disruption and is a cost-effective alternative to regular 60-watt bulbs. The light bulb wattage you need will depend on where the bulb will be used and its purpose. If you simply want to replace an old incandescent bulb with an LED one, you may want to find the lumens equivalent for the wattage of the old bulb. If you are swapping a CFL or halogen bulb for an LED (or vice versa), the equivalent bulb will display the same number of lumens, but the wattage will be different. Over 100 tiny LEDs recreate the vintage look, and rechargeable, this cordless bulb can be charged using the micro USB included giving around four hours of light from a one and a half hour charge. This bulb has been designed for independent use, and cannot be screwed into a light fitting, the screw in is deliberately just a little too large to fit to avoid accidentally fitting into an existing lamp. The number indicates the diameter of the base or the distance between the pins (depending on the bulb type) in millimetres.