WHITEHOUSE BULB FITTING GUIDE
Which Bulb Fitting Do I Have?
Use simple pictures and everyday names to identify common bulb fittings such as E27, E14, B22, GU10, G9, G4 and MR16.
Visual identification
Choose the base that looks like yours
The plain-English name is shown first, with the fitting code underneath. Use the closest visual match, then launch the Bulb Finder with that fitting already selected.
E27
Large Screw
Commonly used for:
Important: matching the base is only the first check
The fitting must physically match, but voltage, bulb size, shape, dimming, enclosed-fitting suitability and any special appliance requirements can also matter. For appliance or specialist lamps, use the exact manufacturer specification where available.
Common questions
Bulb fitting questions answered simply
What does E27 mean?
E27 is the technical code for a large Edison screw lamp base. In the Whitehouse tools we describe it first as “Large Screw” so it is easier to recognise.
What is the difference between B22 and E27?
B22 uses side pins and a push-and-twist action. E27 uses a threaded screw base. They are not interchangeable.
Is every downlight bulb GU10?
No. GU10 is very common, but some downlights use two-pin lamp types such as MR16-family lamps or integrated LED modules. Check the base before ordering.
Can I replace a filament bulb with LED?
Often yes when the base, physical size, voltage and fitting requirements are compatible. The LED wattage may be much lower for a similar light output, so compare brightness in lumens where possible.