7W, 10W, 12W, 15W or 20W: Which Spotlight Wattage?

Pick from the bottom of the ladder unless the fitting sits a long way from what it lights. For one accent on art or an alcove under a normal 8 ft ceiling, 7W is usually the right spotlight wattage to choose, and 20W is a searchlight. Watts measure what the fitting draws out of the wall, not what it puts on your wall, so the number in that dropdown cannot answer the question by itself.

Houseland lists Wattage as 7W, 10W, 12W, 15W or 20W and a 24 degree beam angle from source. It publishes no lumen output. Any page telling you this fitting makes 1,100 lumens at 12W is inventing the figure, and we are not going to. Size it from geometry and published efficiency data instead.

Why doesn't the wattage number tell you how bright it is?

Watts are the input and lumens are the output, and the ratio between them has moved a long way. The US Department of Energy puts LED efficacy at up to 150 lumens per watt or more in some specialized instances, which is why a figure that meant something on a 60W incandescent bulb means almost nothing on a 7W spot.

The gap is still widening. The DOE's final rule for general service lamps raises the floor from 45 lumens per watt to more than 120 lumens per watt, with manufacturers required to comply from July 25, 2028. Two fittings rated at the same 12W, built five years apart, can differ by half.

BRANZ Bulletin 647 publishes an approximate anchor for ordinary LED lamps, reproduced below. Treat it as a rough benchmark for LED lamps in general, never as a spec for a fitting that has published no lumens of its own.

There is a reason the figure is missing rather than hidden. The Lighting Facts panel that prints brightness in lumens on a bulb box is required by 16 CFR 305.23, and it hangs off the definition of a lamp: a medium screw, candelabra, GU-10 or GU-24 base, 310 to 2,600 lumens. A hardwired fitting with the light source built in has no base, so nobody is obliged to print the number for it. That is worth knowing before you assume a seller with no lumen figure is hiding something.

How wide is the pool of light from a 24 degree beam?

Roughly 0.43 times the throw. Beam diameter is 2 x distance x tan(half the beam angle), so a 24 degree cone opens by about 5 in of width for every foot it travels, and from an 8 ft ceiling it lands a circle about 3.4 ft across on the floor.

That concentration is why a narrow beam punches above its wattage. The DOE's own explanation is that an LED's small size gives good optical control, while with older lamp types much of the light they produce is lost within the fixture or heads somewhere useless, with only 50% to 60% of it escaping in many fixture types. Halve the beam angle and the same lumens land on roughly a quarter of the area, so a 7W narrow spot on one picture can read as brighter than a 12W wide fitting on the same wall.

What brightness should you actually be aiming at?

Aim at a foot-candle target, then work backwards. Stetra Lighting's residential targets put living room ambient at 5-15 fc, with 20-50 fc at a reading chair, kitchen ambient at 10-20 fc and 30-50 fc at the countertop plane, and bedroom ambient at 3-10 fc. An accent is judged against that background, not on its own: the Lighting Design Lab's rule is that a highlight must be at least three times as bright as the ambient to register as an accent at all, with 5:1 producing a distinct focal area and 10:1 the minimum for a strong one.

Now put the two halves together. A 3.4 ft circle covers about 9 sq ft. Drop the 1,000 lumen row from the BRANZ table into it and you get around 110 fc if every lumen landed evenly inside the beam, which is a ceiling figure rather than a promise, since real fittings lose light and the middle of a beam is always brighter than its edge. Even the 400 lumen row works out near 44 fc.

Against a 3-10 fc bedroom, the smallest step on this ladder is already several times the room, which is the definition of an accent, and 20W in the same spot would be a ten-to-one glare bomb. A bedroom is where this goes wrong most often; if the goal is a soft glow behind something rather than a beam on it, a backlit panel or a strip is a better fit than a spot of any wattage.

Which spotlight wattage should you choose for your room?

Choose 7W for a single accent on art, a shelf or an alcove at normal ceiling height; step to 10W or 12W once the throw passes about 10 ft or the target is a whole alcove rather than one frame; keep 15W and 20W for stairwells, double-height rooms and any run where the fitting is far from its subject.

Three things push you up the ladder, and floor area is not one of them. Throw distance is the first, because the lit circle grows with it and the light per square foot falls away. The second is how bright the background already is: a sunlit kitchen sitting at 30-50 fc on the counter swallows an accent that would be theatrical in a 3-10 fc bedroom. The third is how many fittings share the job, since four heads on one wall each need less than one head doing everything.

Houseland lists voltage as AC85V-260V and light temperature as Warm White 3000K, Neutral White 4000K or Cool White 6000K. Those set colour, not quantity, and none of them converts into brightness. Warm White 3000K is the usual pick for a living room or bedroom accent; Cool White 6000K reads harsher on skin and on warm-toned art, and reads cleaner over a work surface.

From the shop

Adjustable Ceiling Spotlight, Surface Mounted LED Downlight, CRI 98

Wattage runs 7W, 10W, 12W, 15W or 20W with a 24 degree beam angle from source, and Warm White 3000K, Neutral White 4000K or Cool White 6000K. Voltage is AC85V-260V, and CRI is 98.

View the adjustable ceiling spotlight — 6 fixture colours & current price

How do you check a spotlight before you order it?

Six checks, in this order, and the first two decide whether you buy at all.

1. Settle whether it is recessed or surface mounted before anything else. It is a surface mounted LED downlight, and that single word decides whether you cut a hole in your ceiling. It sits on the surface, so nothing gets cut.
2. Measure the throw, then multiply by 0.43. Tape from where the fitting will sit to the middle of what it lights. If the circle you get is smaller than the picture, you need two heads rather than more watts.
3. Ask the seller for a lumen or candela figure in writing. If nobody can produce one, the number does not exist for that fitting, and a figure copied off a competitor's similar-looking 12W spot is worth nothing.
4. Check the dimming option on the variant you are actually selecting. Dimming is the honest fix for a spot that turns out too strong, though low-end flicker is the thing to test for once you have it on the ceiling.
5. CRI is about color faithfulness, not output.
6. Book the electrician before the fitting arrives. This is a hardwired ceiling fixture on an AC85V-260V supply. In England and Wales that work falls under Part P of the Building Regulations; in the US it answers to the NEC as your local authority has adopted it. Neither is a job to improvise, and the same question comes up with backlit wall pieces.

Is 20W ever the right choice?

Yes, when the fitting is far from its subject or fighting daylight. Put one at the top of a 20 ft stairwell and the 24 degree cone arrives 8.5 ft wide, spreading across roughly 57 sq ft, which is six times the area a throw of 8 ft has to cover. The same output that would be brutal over a bedside table is merely adequate there. Double-height living rooms, tall entrance halls and a bright kitchen island in full sun are the honest homes for the top of this ladder.

The wattage question also has an answer that is not a wattage. If what you want is even light across a whole wall or a whole room, a 24 degree beam is the wrong tool at any output, and no amount of watts fixes the shape. BRANZ puts it plainly: a 60 degree beam angle is recommended for general lighting, while a narrow beam suits highlighting a display piece. New Zealand's own building code guidance, quoted in the same bulletin, warns that luminaires with concentrated or narrow beam distribution require particular care with spacing if minimum illuminance criteria are to be met. Three or four modest heads on a track, or a recessed run at a wider angle, will beat one heroic spot every time.

What I'd do

7W, Warm White 3000K, one target. That is the setting I would order for a picture, a shelf or a reading nook under an 8 ft ceiling, and I would buy a second head before I bought a bigger one, because two 7W pools 3.4 ft wide cover a long wall far better than one 20W pool does.

Then I would test it in the dark. Switch on the room lights first, then the spot: if the object does not clearly separate from its background, you are under the 3:1 accent threshold and the fix is aim or a second fitting before it is watts. Its CRI 98 is useful if color faithfulness on artwork is the reason you are buying and easy to sanity-check against a printed photo once it is up.

If the wall itself is the thing you want lit rather than an object on it, a spot is the wrong shape of light and a wall-mounted fitting throwing a wash will serve you better.