What's the Best Bulb for a Table Lamp? Wattage, Colour Temp & Dimming Explained

Buying the right table lamp is only half the job. The bulb you put in it determines almost everything about how the lamp actually performs, whether it flickers on a dimmer, whether it flatters a room or washes it out, whether it's doing the job you actually bought the lamp for in the first place. Here's the practical, plain-English version of what actually matters.

Colour temperature: what to buy for which lamp

Colour temperature is measured in Kelvin, and it determines how warm or cool a bulb's light appears. For ambient and bedside use, the standard recommendation is 2700K to 3000K, warm, soft, and relaxing, the same reference point that shows up consistently across most residential lighting advice. For a desk or task lamp doing close work, reading fine print, working on a laptop, up to 4000K is more common, since a slightly cooler light offers a touch more clarity and contrast for detailed tasks.

The short version: if the lamp's job is atmosphere, stay at 2700K to 3000K. If its job is focused task work, 3500K to 4000K is a reasonable stretch upward, though even task lamps generally don't need to go higher than that in a home setting.

Wattage: think in LED-equivalent, not raw watts

Most people asking about wattage are still thinking in old incandescent terms, which no longer maps cleanly onto how LED bulbs are rated. Here's the practical conversion.

A 40W-equivalent LED typically draws around 4W to 6W of actual power and suits most bedside lamps, enough soft light for reading without flooding the room. A 60W-equivalent LED typically draws around 8W to 9W and suits a desk lamp or a brighter reading lamp where you genuinely need more light on the page or the work surface in front of you.

The equivalence number, the "40W" or "60W" printed on the packaging, is what you should actually shop by. The real wattage draw matters mainly for your electricity bill, and it's dramatically lower than the equivalent number implies, which is the whole point of LED in the first place.

Worth knowing too: rechargeable LED bulbs, built to switch automatically to backup battery power during a power cut, are available in the same standard fittings and wattages as regular LED bulbs. If load shedding is a genuine consideration for where you're putting a table lamp, it's a real option worth looking at, rather than something separate from the bulb decision entirely.

What bulb should I actually buy?

The honest answer has less to do with brand and more to do with two practical things: base type and shape.

Base type is what actually determines whether a bulb fits your lamp at all. E27 (the larger screw base) and B22 (a bayonet fitting, push and twist rather than screw) are the two most common bases in South African homes, with E14 (a smaller screw base, sometimes called a candle base) also widely used on table and bedside lamps specifically. GU10, G9, and G4 fittings show up on some spotlights and smaller decorative fixtures too, but they're far less likely on a standard table lamp. Check your existing bulb, or the lamp's product listing, before buying a replacement, since none of these are interchangeable without an adapter.

Shape matters for anything with a visible or partially exposed bulb. A standard A60 pear-shaped bulb suits most enclosed shades where the bulb itself isn't seen. Filament-style bulbs (often labelled ST64, G80, or G95), with a visible spiral or exposed-look filament, suit lamps where the bulb itself is part of the design rather than hidden inside a shade.

Beyond base and shape, the two specifications that actually matter for quality of light are colour temperature (covered above) and CRI, the colour rendering index, where 80+ is a reasonable minimum and 90+ gives noticeably more accurate, natural-looking colour.

Can I use an LED bulb in any table lamp?

Yes, in virtually every standard table lamp fitting. LED has genuinely become the default, and there's very little reason to reach for anything else.

The one real caveat worth knowing: a fully enclosed shade, or a lamp with a built-in dimmer, needs an LED bulb specifically rated for that use, either an enclosed-fixture-rated LED or a genuinely dimmable LED, rather than a standard non-dimmable bulb. Using the wrong type in either situation can cause flickering, buzzing, or a shortened bulb lifespan. This is a small detail that trips up a lot of people who assume any LED bulb works everywhere.

Why dimming actually works the way it does

A standard, non-dimmable LED bulb fitted into a lamp with a dimmer switch will typically flicker or buzz rather than dim smoothly, and it's worth understanding why rather than just accepting it as a fact.

An LED bulb's internal driver, the small component that converts household electricity into something the LED can use, is built to expect a steady, consistent voltage. A dimmer switch works by varying that voltage. A standard driver isn't designed to handle that variation gracefully, so instead of a smooth dip in brightness, you get flickering, a buzzing sound, or in some cases the bulb simply refuses to dim at all. A genuinely dimmable LED bulb has a driver built specifically to handle that varying voltage cleanly. If your lamp has a dimmer, or you're planning to add one, buying a bulb explicitly labelled dimmable is not optional, it's the actual mechanism that makes dimming work.

Do table lamps come with bulbs included?

This varies by product, so always check the individual listing before assuming either way. It's a quick check worth doing before checkout rather than an assumption worth making either direction.

Quick reference

Where to start

Browse the full table and desk lamp collection at Lighting.co.za, and head to the bulbs collection to shop by base type and colour temperature directly. If you haven't already, our table lamp sizing guide covers the practical proportion rules that come before the bulb decision. Nationwide delivery is available across South Africa.