R63 (E27 Reflector) LED Bulbs

R63 describes the reflector shape and nominal diameter, approximately 63mm. E27 identifies the Edison screw (ES) cap. Check the actual product dimensions and cap code against your existing lamp rather than relying on the collection name alone.

Wattage is a useful starting point when matching an existing LED, but compare lumens for brightness. LEDs with the same wattage can give different light output. For an older halogen or incandescent lamp, use the manufacturer's replacement rating and lumen output rather than choosing the same wattage.

Check cap type, reflector diameter and overall length, plus clearance inside the fitting. R63 and R50 reflectors are different sizes and the caps in these ranges differ. Check the fitting's lamp requirements before ordering.

Choose a lamp explicitly marked dimmable and check the lamp and dimmer manufacturers' compatibility guidance. The dimmer's LED load range and supported number of lamps matter; a dimmable lamp alone does not guarantee a compatible system.

Compare Kelvin (K) values rather than colour names alone. Around 2700K–3000K gives a warm appearance, 4000K a cooler white and 5000K–6500K a daylight appearance. Match the existing Kelvin rating where consistency matters, and check lumens separately for brightness. Also compare beam angle: a wider beam spreads light over a larger area, while a narrower beam concentrates it.