GU10 bulbs, is 4.2W same as 4.7W or 5W - all same lumens rating

OM2

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I need to replace some GU10 bulbs.

The ones I need to replace are 350 lumens.

I've seen some on toolstation. 4.2W and 345 lumens.
But then Screwfix have 5W ones that are also 345 lumens.
Amazon have 4.7W ones that are also 345 lumens.

Amazon is where I want to buy - cost £3 more for a pack of 10 - but saves me a trip.
Or should I buy from toolstation? Maybe the 0.5W saving will match my petrol saving over 1 year? LOL

The original ones are 5W from Wickes. They don't have anymore.

Thanks.
 
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That which you require is "light" measured in lumens - about 350 lm in your case. However, it really would not much matter if a particular brand of lamp were between 340 to 360 lm, since that is less than 3% difference

LED's have been getting more efficient so the Wattage is no real indication of brightness and the supposed savings for 0.5 W would be largely academic - even if the figures were accurate.
 
What LED bulbs don't say is this one the chip is stretched to the limit and likely has a short life or this chip is under driven and likely to last for years, or this one uses a pulse width modulated driver and this one simple capacitor.

So spread out the adverts, put on a blindfold, and stick in a pin.
 

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