Joyacy — Residential decorative lighting: how room size | joyacy.com
Ambient, task and accent — added in that order — turn a lumen total into a room that works, with dimming and pendant heights decided along the way.
Step 1 — measure and multiply. Ten minutes with a tape gives the floor area; area × the room's lm/m² band gives the lumen total. The typical failure here is sizing by watts, which underrates LED output and under-lights the room.
Step 2 — build the ambient layer. Ceiling fixtures and pendants carry most of the total. Hang pendants 700–900 mm above a dining table, 800–900 mm above a kitchen island, and keep at least 2,000 mm clearance under anything in a walking path.
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Step 3 — add the task layer. Kitchen benches need 300–500 lux; mirrors and wardrobes need Ra 90+. The failure to avoid is asking the ambient layer to do task work — it cannot deliver bench-level lux from ceiling height.
Step 4 — finish with accents and sort the dimming. Old leading-edge dimmers want a 40–60 W minimum load while LED lamps draw 5–15 W, and that mismatch is the usual cause of flicker; dimmers rated for LED loads work from about 10 W.
Step 5 — verify. Divide delivered lumens by floor area and compare with the target: 1,500 lm over 15 m² is 100 lux, a normal living-room level. Then check the L70 figure: a 25,000 h lamp at 4 h/day runs about 17 years before output falls to 70% of new.
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