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WHAT IS A GOLF BALL LIGHTBULB?
Like their name suggests, golf ball lightbulbs are small, round bulbs designed for use in more decorative fixtures, or where space is at a premium. They are most commonly seen in smaller desk lamps or wall lights and are sometimes referred to as ‘round’ bulbs (although this can be quite an ambiguous term when it comes to lightbulbs).
As golf ball bulbs are used in a variety of fittings, there are many different styles and bases available. They are commonly fitted with either a B22d bayonet cap (sometimes abbreviated to BC), or an E27 Edison screw (ES) base. The B22d cap is the ‘push and twist’ type of fitting that is used on the majority of lamps in the UK, while the E27 is the screw-in type that is more common in Europe and the US.
Other types of base include B15 small bayonet cap (SBC) and E14 small Edison screw (SES). These are simply smaller versions of bayonet and Edison caps, used primarily on smaller lamps and fittings.
Golf ball bulbs are quite distinctive as the bulb is often not much larger than its base. Think of a golf ball sat on a very wide tee. It is easy to confuse golf ball bulbs with GLS bulbs when shopping online, as they can sometimes look quite similar when viewed on a web page.
Traditional incandescent candle bulbs will be in use in the UK until September 2018, when an EU directive takes effect banning their sale. They will be replaced by energy-saving alternatives such as CFL and LED bulbs.
The CFL (Compact Fluorescent Lamp) lightbulb was the early replacement for high-energy bulbs, but they often don’t look like their incandescent counterparts. It is instead a narrow fluorescent tube that is turned into a compact shape (hence its name). It is designed to be a direct, energy-saving replacement, so it is compatible with existing fittings, but it looks completely different.
As golf ball bulbs are so small, there are fewer CFL equivalents. LED golf ball lightbulbs, however, have been designed to look like the incandescent bulbs they supersede. They have the classic golf ball shape and as the technology develops, they are beginning to look more like traditional bulbs.
These will often be opaque (sometimes described as ‘pearl’ or ‘opal’) and they are made out of glass or a heat-resistant thermal plastic. Many have a white plastic base to hide the bulb’s componentry, but there are now models available that are completely transparent. Look out for the distinctive yellow ‘filaments’ of these LED lightbulbs, designed to mimic the filaments of the traditional incandescent candles.