This does depend on a number of factors. Light Emitting Diodes (LED's) emittance is measured primarily in Lumens & Kelvins. For a comprehensive guide please see our Light Bulbs Information Page for more details.
Our BC and SBC range of lampholders are both 2 amp rated so you can use a bulb up to 60W.
Our ES lampholders are higher rated 4 amps so you can use a bulb of up to 100W.
You can use LED bulbs with our lampholders as long as they are the equivalent wattage rating to above. Please see our Light Bulbs Information Page for more details.
The other consideration when choosing a bulb is what shade will be used. Generally the shade should have the same wattage rating as the bulb. LED bulbs give off so much less heat that we would advise they be used for fabric & paper shades.
SBC - small bayonet cap fitting takes a SBC bulb. Also known as B15d . Measures 15mm across.
BC - bayonet cap fitting takes a BC bulb. Also known as B22d. Measures 22mm across.
SES - small edison screw fitting takes a SES bulb. Also known as E14. Measures 14mm across.
ES - edison screw fitting takes an ES bulb. Also known as E27. Measures 27mm across.
GES - giant edison screw fitting takes a GES bulb. Also known as E40.
We recommend you use dimmers particularly with our filament LED bulbs so allowing you to appreciate the real beauty of the filaments in differing light conditions. Your existing dimmer switches may not work properly with LED bulbs if they are leading edge dimmers and this may lead to a shortened bulb life, a lower light output and a buzzing sound. For an optimum performance, you must use trailing edge dimmers which have lower minimum loads and are designed to be used with LED bulbs.