Best Buys
The Which? Best Buy award is given to
products with high total test scores that perform consistently well in
our rigorous lab tests and excel in all key areas.
Energy Savers
We award the Energy Saver logo to
products that our testing shows are very energy efficient, meaning
they'll cost you less to run.
Don't Buys
The Which? Don't Buy logo alerts you
to the products that performed extremely poorly in one or more key
areas of our tests.
Light output and efficiency
Shows how efficiently a bulb uses the power it draws to give its light output
Light output at start-up
The light bulb's brightness when switched on at 25 degC
Dimming over lifetime
To what extent the bulb dims over our 5,000 hours test
Lifetime durability
How well the five samples on test endure our 5,000 hours on test
On/off switching durability
How well three samples endured our 30,000 on/off switches test
Overall durability
Combined score for the 5,000 hours on test, dimming over lifetime and 30,000 switches tests
Fitting
Small screw (E14 or SES);Large screw (E27 or ES);Standard bayonet (B22)
Price
For Best Buys we give the cheapest widely available high street price as we went to press. Prices for other models are a guide to what you should expect to pay.
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