Question 1

Are all E27 bulbs exactly the same size?

Accepted Answer

No. Only the 27 mm base is standardised; the body varies depending on the format, such as A60, globe, candle, tubular, PAR and others. Dimensions should therefore always be checked before installation in enclosed luminaires or where space is limited.

Question 2

Can an E27 bulb be used in an E14 lamp holder?

Accepted Answer

No. They are not compatible because E27 measures 27 mm while E14 measures 14 mm. Although adapters are available, they are not ideal because of potential issues with fit, heat or safety, so using the correct base is preferable.

Question 3

Do E27 LED bulbs operate directly at 230 V?

Accepted Answer

Yes. Although there are models that operate at 12 or 24 V, for example, most are designed for 230 V and include an integrated driver. However, the manufacturer’s voltage range should always be checked because the E27 base itself does not determine the supply voltage.

Question 4

Can I install an E27 LED bulb with more watts than the original?

Accepted Answer

You should focus on lumens rather than watts, as lumens indicate the amount of light. An LED bulb can provide the same or more light while consuming less energy than an older bulb. It is therefore possible to achieve more light with lower energy consumption.

Question 5

How do I know if an E27 bulb is dimmable?

Accepted Answer

It should be marked as “dimmable” on the packaging, as not all E27 bulbs support dimming. It must also be compatible with the installed dimmer to avoid flickering or a limited dimming range.

Question 6

Can an E27 bulb be installed in an enclosed luminaire?

Accepted Answer

Yes, provided it physically fits and is designed for this type of installation. Heat dissipation must still be considered, as excessive temperature can reduce the lifespan of the LED.

Question 7

Why can an E27 LED bulb remain faintly lit after it is switched off?

Accepted Answer

This is usually caused by residual currents in the electrical installation, such as those from illuminated switches or dimmers. These small currents can be enough to partially energise the LED and cause a faint glow or flickering.

Question 8

Can I replace a traditional E27 bulb with LED without changing the lamp?

Accepted Answer

Yes, if the base and supply voltage are compatible. However, it is advisable to check the dimensions, lumens, type of light and whether the luminaire is enclosed or dimmed to ensure correct operation.

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