Five numbers decide it: a wattage tier between 7W and 20W, a beam angle of 24 degrees for accent or 36 to 60 degrees for a wash, a CRI of 90 or higher, a color temperature of 3000K, 4000K or 6000K, and a voltage window that covers your supply. Any surface mounted spotlight buying guide that skips one of those is selling you a shape, not a light. Houseland's adjustable ceiling spotlight prints all 5 on one page: 7W, 10W, 12W, 15W or 20W, a 24 degree beam, CRI 98, 3 color temperatures and AC85V-260V.
The catch is that listings quote those numbers in different orders and units, and the 2 that bite hardest, dimmer type and body size, are usually missing altogether. Each check below carries the figure to look for, the source it comes from, and the case where the figure changes.
Which five numbers should a surface mounted spotlight buying guide put first?
Wattage, beam angle, CRI, color temperature and voltage, in that order, because that is the order in which a wrong pick costs the most to fix. A wrong beam angle or CRI means a second fixture; a wrong color temperature means a second fixture too, since the LED is built in.
| Check | Number to look for | What it decides |
|---|---|---|
| Wattage tier | 7W for a shelf or closet, 12W to 15W for art, 20W for a counter | Brightness, with no lumen figure to compare across brands |
| Beam angle | 24 degrees for accent, 36 to 60 degrees for a wall wash | Circle size on the target, glare off the target |
| CRI | 90 minimum, 98 for food, fabric and paintings | Whether reds and skin look right |
| Color temperature | 3000K warm, 4000K neutral, 6000K cool | Room mood, and whether it matches your other lamps |
| Voltage | A range that contains 120V, such as AC85V-260V | Whether it runs without a driver box |
Watts are not brightness. 16 CFR 305.23 requires a lamp package to show "Brightness" in average initial lumens rounded to the nearest 5, and a Light Appearance scale running from 2,600K on the left to 6,600K on the right, but that label is written for replaceable bulbs. Integrated COB fixtures rarely carry one, and the Houseland product page publishes wattage tiers rather than a lumen count. So compare tiers within one listing, where the same COB chip and lens sit behind every wattage, rather than a 15W from one brand against a 12W from another.
How wide is a 24 degree beam, and when do you want 36 or 60?
A 24 degree beam lights a circle roughly 30.6 in (77.7 cm) across from 6 ft away, and that is the size of one painting, one plant or one end of a counter. The IES defines beam angle as the angle between the two directions where intensity falls to 50% of the maximum, the full width at half maximum, as the Beam angle article records, so the number describes the bright core and not the edge of visible light. Older definitions measured to 10% and that wider figure is now called the field angle, which is why 2 fixtures with the same 24 degree label can look different at the rim.
The circle diameter is 2 times the distance times the tangent of half the angle, so it scales with distance in a straight line.
| Beam angle | 3 ft (0.9 m) away | 6 ft (1.8 m) away | 8 ft (2.4 m) away |
|---|---|---|---|
| 24 degrees | 15.3 in (38.9 cm) | 30.6 in (77.7 cm) | 40.8 in (103.6 cm) |
| 36 degrees | 23.4 in (59.4 cm) | 46.8 in (118.9 cm) | 62.4 in (158.5 cm) |
| 60 degrees | 41.6 in (105.7 cm) | 83.1 in (211.1 cm) | 110.9 in (281.7 cm) |
HomElectrical's beam angle primer files 10 to 20 degrees as spot, 30 degrees or less as narrow, 30 to 60 degrees as medium and anything over 60 degrees as wide. The brightness inside the circle drops with the square of the distance, the inverse-square law, so the same 24 degree head at 8 ft delivers about half the light per square foot it delivers at 6 ft. Seattle's Lighting Design Lab puts the accent target in ratios: 2:1 against the room reads flat, 5:1 gives a distinct focal area, 10:1 is the minimum for a strong accent and 15:1 is dramatic, and Colorbeam's knowledge base quotes the IESNA recommendation of 5:1 accent to ambient. A narrow 24 degree beam reaches 5:1 on a picture with a 7W to 12W tier; a 60 degree wash needs 3 to 4 times the wattage for the same ratio on the same picture.
Pick 24 degrees for a picture, a plant, a shelf display or a counter zone you can see from the sofa. Pick 36 to 60 degrees for a wall you want evenly lit end to end, and read how to measure for a ceiling light first so the fixture-to-wall distance is a number and not a guess. The rotation and fold ranges decide whether the head can reach that wall at all: a 360 degree base plus a 90 degree fold lets a ceiling-mounted head aim horizontally at a wall, which a fixed downlight cannot do.
Does CRI 98 matter more than the wattage?
For anything with red in it, yes: a CRI 98 source at 12W shows a steak, a terracotta pot or a face more faithfully than a CRI 80 source at 20W. The color rendering index is a measure of how faithfully a source reveals object colors against a reference, and Wikipedia's summary of the field notes that typical white LEDs sit at CRI 80 or more while some makers claim up to 98. The same article is blunt that CRI does not describe the apparent color of the light; that job belongs to correlated color temperature, the Kelvin figure.
Houseland's COB spotlight is rated CRI 98, in Warm White 3000K, Neutral White 4000K or Cool White 6000K — 3000K is softer, 4000K balanced, 6000K brighter. The color temperature convention runs the other way from physics: 2,700K to 3,000K is called warm and yellowish, anything over 5,000K is called cool and bluish. Buy 3000K for living rooms and bedrooms, 4000K for kitchen task zones, and 6000K only where you already run daylight tubes, because 6000K next to a 2700K table lamp looks like a fault. The mismatch shows up first on fabric and paint, which is why white bedding looks dull under some LED light and a green wall reads grey once the lights are on.
Then the case where the answer changes: a closet or a garage shelf does not need CRI 98, and a 7W tier at CRI 80 from any brand will do that job. Pay for high CRI where you look at color for pleasure or for cooking, and put the money into wattage where you only need to find things.
From the shop
Adjustable Ceiling Spotlight, Surface Mounted LED Downlight, CRI 98
Surface mounted COB spotlight with a 360 degree rotatable base and 90 degree folding head, 24 degree beam and CRI 98, in 7W, 10W, 12W, 15W or 20W and 3000K, 4000K or 6000K, on AC85V-260V. Dimmable versions available.
View the adjustable ceiling spotlight — 6 fixture colours & current priceWill it dim, and which dimmer does it need?
Only the variants sold as Dimmable dim, and they dim well only on a dimmer built for LED loads, which in practice means trailing edge and a minimum load your fixture count actually meets. Houseland sells the 7W, 12W, 15W and 20W tiers in a Dimmable version and asks that a qualified electrician confirm dimmer compatibility if that version is selected.
Two families of wall dimmer exist. Wikipedia's Dimmer entry describes the TRIAC circuit that cuts the front of each AC half-wave as a leading-edge or forward-phase dimmer, and the IGBT circuit that chops the falling side of the sine wave as trailing-edge or reverse-phase, which does away with most of the TRIAC noise. LEDYi's comparison puts the minimum load of a leading edge dimmer at 20W to 40W and a trailing edge dimmer at 5W to 10W, so a single 7W head on an old leading-edge dimmer sits below the floor and buzzes or flickers.
Lutron's Application Note 487 says the same thing from the maker's side: its published minimum-watt ratings are based on incandescent and halogen lamps and do not apply to LED loads, for which the minimum is a number of lamps that has to be tested per lamp model. It lists what an under-loaded dimmer does: glow when off, flash when off, reduced dimming range, intermittent operation and flicker. The check is simple: count the dimmable heads on the circuit, multiply by the wattage tier, and compare that against the LED minimum on the dimmer's own sheet, not the incandescent one.
- Find the dimmer model on the faceplate and pull its LED spec sheet; a plain 600W incandescent dimmer from the 1990s is leading edge.
- Total the fixtures on that switch: 3 heads at 12W is 36W, which clears a 10W trailing-edge floor and a 20W leading-edge floor, while 1 head at 7W clears neither.
- Choose the non-dimmable variant if the circuit is a plain switch; a non-dimmable LED on a dimmer flickers and shortens its own life.
- Have the electrician test at 10% and at 100% before the ceiling is patched; a fixture that dims to 30% and drops out is a minimum-load symptom.
Will the body fit the ceiling, and can the box carry it?
Measure the ceiling clutter first, because a surface body is about 4 in tall and sits in the open. Houseland's 10W to 20W body is about 3.5 in wide x 4.1 in high (90 x 105 mm), and the 7W body is about 2.8 in wide x 4.5 in high (70 x 115 mm), so the small tier is narrower but not shorter. Add the fold: a head folded to 90 degrees swings its full height sideways, so leave that much clear of a cabinet top, a curtain rail or a smoke alarm in the direction you plan to aim.
The box behind it is regulated. IRC section E3905.6.2, in the Texas 2024 chapter 39 mirror, requires a ceiling lighting outlet box to support a luminaire weighing up to 50 pounds (22.7 kg) and says a luminaire heavier than that must be supported independently of the box. A small aluminum head is nowhere near the limit; the point is that a surface fixture must screw to a proper box, not to drywall, and the product page says the same: it is a hardwired fixture, mount it to the ceiling point and have a qualified electrician connect the AC wiring.
Closets have their own rule. IRC E4003.12, in chapter 40 of the same code, allows surface-mounted LED luminaires in a clothes closet only with a completely enclosed light source, mounted on the wall above the door or on the ceiling with 12 in (305 mm) clear between the fixture and the nearest point of the storage space. Ask the electrician whether the anti-glare lens on your chosen head counts as a completely enclosed source under the local code before you put one in a closet.
Who should buy which wattage and beam?
Buy the 7W tier at 3000K for a shelf, a niche or a closet, the 12W to 15W Dimmable tier at 3000K for a painting or a plant, and the 20W tier at 4000K for a kitchen counter or a desk where the target sits 6 ft or more below the head. The whole wall lamps collection lists the dimmable and non-dimmable versions side by side, and the version decides the dimmer, not the other way round.
Who it does not suit: someone who wants one fixture to light a whole room, because a 24 degree beam is an accent tool and a 12 ft by 12 ft room lit by a single 30 in circle looks like a stage. The 10 footcandles (107 lux) that IBC 1204.3 asks for as an average across a room at 30 in (762 mm) above the floor is a general-light job; use spots on top of that layer, not instead of it. The Wikipedia entry on glare describes discomfort glare as coming from small artificial lights, ceiling fixtures among them, that are far brighter than their surroundings, which is exactly what an accent head aimed toward a seat does, so aim at objects, never at people, and see why a bare bulb is visible from bed for the same problem on a wall.
It also does not suit a bathroom or a covered porch: the product page states no damp or wet location rating, so keep it to dry rooms. And anyone on a supply outside AC85V-260V, or on a low-voltage track system, needs a different product entirely, since this one takes mains AC straight in.
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