Do you know if this is 63mm in diameter?

Hi. This is 50mm diameter. Try searching for 'R63 Gu10'

11w don't seem to come in cool white. Would 5w cool white be brighter than 11w warm white?

The cool white version are out of stock. The warm white have the same lumens rating however they will appear not as bright as the colour is more of a yellow white rather than white.

Brand	Lectrolite
Manufacturer	Lectrolite
Product Dimensions	7.4 x 5 x 5 cm; 68 g
Number of Items	1
Style	GU10 Energy saving
Colour	Warm White
Shape	Straight
Material	Heat resistant plastic
Finish types	Silver sides for a nice apprerance.
Voltage	240 Volts
Specific Uses	Single or multiple fittings without dimmers.
Special features	Frosted
Light Direction	Widespread
Plug Format	2 pin fitting
Power and Plug Description:	AC/DC
Batteries included?	No
Batteries Required?	No
Type of Bulb	Low Energy Saving Compact Fluorescent CFL
Cap Type	GU10
EU Energy Efficiency Label	B
Wattage	11 watts
Wattage	11 Watts
Incandescent Equivalent	45 Watts
Bulb Features	Replaces Halogen GU10 bulbs
Colour Temperature	2700 Kelvin
Average Life	10000 Hours
Bulb Diameter	50 Millimetres
Bulb Length	74 Millimetres
Start Up Time	ALL CFL BULBS TAKE A SHORT TIME TO REACH FULL BRIGHTNESS IF THEY HAVENT BEEN ON FOR A WHILE. (Allowing your eyes to adjust to the brightness)
Warm Up Time	All CFL bulbs take a short time to reach full brightness
Item Weight	68 g
Guaranteed software updates until	unknown

11w = 50w GU10 CFL Low Energy Saving Warm 2700k or Cool White 4000k Spot Light Bulb 240v (Warm White 2700k) [Energy Class B]

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