Entry lighting heights and lumen targets

An entry gets lit twice: once by the fitting, and once by the eye that has just walked in from a street at 10,000 lux or a night at almost nothing. That second condition is why the numbers here are not the numbers for a living room, and why the height of the fixture matters as much as its output.

Everything is measured from the finished floor#

The datum is the finished floor, not the subfloor and not the joist line. It sounds pedantic until you cost it. A stone or porcelain entry floor is commonly 10 mm of tile on 6 mm of adhesive on 6 mm of backer board, which is 22 mm, close to an inch. A timber floor on battens can be 45 mm. If the electrician sets the drop against a bare deck and the floor arrives later, the fixture ends up an inch or two lower than drawn, and in an entry with only 12 in of drop to play with that is a sixth of the whole allowance.

The second datum is the door head, at 80 in (2,032 mm) in almost every house. That line is not decoration: it is the height every cased opening, every architrave and every transom in the plan is set to. Hold both numbers before you choose a fixture, and check the ceiling height itself against ceiling heights and datum lines.

Where 84 in comes from, and what it is not#

The usual justification for 7 ft is head clearance, and the arithmetic does not support it. Adult stature at the 95th percentile is about 74 in (188 cm), and adding an inch of shoe gives 75 in. Head clearance alone would be satisfied at 78 in with 3 in to spare, and building codes are content with 80 in of headroom under a beam.

So the extra 6 in is doing something else.

Drop by ceiling height#

Fixture drop is the ceiling height minus 84 in, minus the canopy. A typical canopy and stem assembly needs 4 in (100 mm) before any shade exists at all.

For the double-height case, sizing the body matters more than the drop. Allow roughly 2.5 to 3 in of fixture height per foot of ceiling height, which for an 18 ft void gives a body 45 to 54 in (114 to 137 cm) tall. Diameter follows the old room rule: add the entry's length and width in feet and read the answer as inches, so a 6 x 8 ft hall takes a 14 in (36 cm) fixture. That rule and its limits are worked through in sizing and hanging pendants and chandeliers.

Stairwells: the nosing line, not the floor#

A fixture over a flight is the one case where 84 in above the floor is not the test. Clearance has to be checked plumb from every tread nosing, because a stair climbs toward the ceiling as it goes. On a flight rising 8 ft, the top tread is 8 ft closer to the fixture than the bottom one.

The method is short. Take the total rise of the flight, subtract it from the ceiling height at the head of the stair, and check the remainder against 84 in for the position where the fixture hangs. Approved Document K in the UK requires 2,000 mm (78.7 in) of headroom over a stair, and the IRC requires 6 ft 8 in (2,032 mm), so a light that drops below the nosing line by even a little is creating a code problem as well as a bruise. Rise, run and headroom are set out in full in stair dimensions.

Relamping is the second constraint and it is routinely forgotten. If the fixture cannot be reached from a landing, the ladder has to stand on a flight, which means either a specialist stair ladder or a winch mechanism specified at first fix, when it is cheap.

How much light, and where it goes#

Illuminance targets for a residential entry sit around 100 to 200 lux (10 to 20 foot-candles) in the IES guidance, which is more than a living room and less than a kitchen. The lumen method converts that into a fixture specification:

installed lumens = area x foot-candles / (CU x LLF)

with CU the coefficient of utilisation, around 0.45 for a domestic fixture in a light-coloured hall, and LLF the light loss factor, around 0.85.

Dark walls change the answer more than most people expect, because the coefficient of utilisation falls with surface reflectance. The dark-finish row above assumes a CU of 0.35 rather than 0.45, and the required output rises by 28 per cent for the same visual result. The full method, room by room, is in how many lumens a room needs, and the room lighting lumen calculator runs it for a given size, ceiling height and surface tone.

Splitting the total matters as much as the total. One overhead source in a hall puts every face in shadow under the brow. A workable split is roughly 60 per cent overhead, 30 per cent on the walls from sconces and 10 per cent accent, which is the layered lighting model applied to a small room. If the entry has a mirror, the wall layer is not optional.

Sconces, mirrors and the vertical band#

Sconce centres belong at 60 to 66 in (152 to 168 cm) above the finished floor. The upper end of that band puts the lamp above standing eye level, which for most adults is 58 to 64 in (147 to 163 cm), and that is what controls glare in a narrow hall where you pass within arm's reach of the fitting.

Beside a mirror the logic inverts. There you want light on a face, so drop the centre to 60 to 65 in and space the pair 36 to 40 in (91 to 102 cm) apart, which brackets a head rather than lighting the ears. Over a console, the bottom of the shade wants to be 36 to 40 in above the top, putting a 30 in console's light at 66 to 70 in. Those two heights, and the mirror size that goes with them, are worked through in entry console and mirror heights.

Recessed downlights follow the spacing criterion rather than a fixed pitch. On a 96 in ceiling with the work plane at floor level, half the mounting height gives 48 in (122 cm) centres, and the first row belongs 18 to 30 in (46 to 76 cm) off the wall so it washes the surface instead of scalloping it. The method is set out in recessed lighting spacing.

Outside the door#

The exterior fitting is sized against the door, not the wall. A pair of lanterns flanking the opening each want to be about one quarter of the door height, which is 20 in (51 cm) for an 80 in leaf. A single lantern on the handle side wants about one third, or 27 in (69 cm). Both are larger than instinct suggests, because a fixture outdoors has no ceiling or wall corner to be measured against and the eye reads it as smaller.

Mount the centre at about 66 in (168 cm) above the threshold and set it 8 to 12 in (20 to 30 cm) clear of the casing so the light falls on the door face rather than on the frame. Warm output, 2700K and no cooler, keeps the entry consistent with the hall behind it, which is the argument made at length in colour temperature and CRI at home. Heights for path, step and wall fittings beyond the door are in outdoor lighting heights and spacing.

The IRC requires an artificial light source at exterior landings serving an egress door and at interior stairways, with switching at each level. That is a minimum, not a design. The useful version puts a switch inside the door and a second at the head of the stair, at the heights given in light switch heights and placement.

Putting the numbers together#

A worked example. A 6 x 8 ft entry with a 108 in ceiling, 80 in doors and pale walls needs about 1,880 installed lumens. Sixty per cent of that, 1,130 lm, goes to a pendant whose base sits at 84 in and whose body is therefore no more than 20 in tall and about 14 in in diameter. Thirty per cent, 560 lm, goes to a pair of sconces centred at 66 in. The last 190 lm is an accent, typically a picture light or a low-level fitting near the floor for night use. Everything is on one dimmer covering a 10 to 1 range, which is the range the eye needs between arriving at noon and arriving at midnight. The entryway numbers this fixture has to coexist with, from console depth to landing size, are in entry hall and landing sizes, and the lux and lumen conversions behind the table are in lumens, lux and watts converted.