Lumens vs Watts: How to Buy the Right Brightness (Without the Math Degree)
"60-watt equivalent" confuses everyone. Watts measure energy used; lumens measure light produced. Here's the conversion table, room-by-room lumen targets, and the two other numbers on the box that actually matter.
Watts measure power consumed; lumens measure light produced. With LEDs the two are no longer linked — an LED makes a 60W-incandescent amount of light (~800 lumens) using only 8–10W. Buy by lumens, check the colour temperature, and treat wattage as the operating cost, not the brightness.
The conversion table (pin this)
| Old incandescent | Brightness | Typical LED wattage |
|---|---|---|
| 40W | ~450 lumens | 5–7W |
| 60W | ~800 lumens | 8–10W |
| 75W | ~1,100 lumens | 10–13W |
| 100W | ~1,600 lumens | 14–18W |
| 150W | ~2,600 lumens | 20–28W |
Why the confusion exists
For a century, watts were a usable brightness proxy because all incandescent bulbs wasted energy at the same rate. LEDs broke the link: brightness now depends on the fixture's efficiency (lumens per watt), which keeps improving. That's why a "100W equivalent" LED from 2026 uses fewer watts than one from 2018 — same lumens, better efficiency. ENERGY STAR–certified LEDs meet verified efficiency and quality thresholds, which is the easy way to avoid the bargain-bin junk.
How many lumens does each room need?
General industry guidance (not a code requirement) — totals for the whole room, all fixtures combined:
| Room | Target (lumens/sq ft) | Example: 150 sq ft room |
|---|---|---|
| Bedroom / living room | 10–20 | 1,500–3,000 lm |
| Kitchen (general) | 30–40 | 4,500–6,000 lm |
| Kitchen counters (task) | 50+ on the surface | under-cabinet strips |
| Bathroom | 30–40 (high CRI at mirror) | 4,500–6,000 lm |
| Home office | 30–40 | 4,500–6,000 lm |
| Garage / workshop | 40–60 | 6,000–9,000 lm |
Dark paint, high ceilings, and aging eyes all push targets up; layered lighting (see The Lighting Vibe Check) matters as much as the total.
The other two numbers on the box
1. Colour temperature (K) — 2700K warm → 5000K daylight. Changes the feel, not the brightness. Full guide: Colour Temperature Guide. 2. CRI (colour rendering index) — how accurate colours look. 80 is standard; 90+ is noticeably better for kitchens, bathrooms, and anywhere skin tones or food matter.
A bulb can be bright (lumens), warm (K), and still render colour badly (CRI) — check all three.
Buying brighter vs buying more fixtures
One 3,000-lumen fixture and three 1,000-lumen fixtures are not the same room. A single bright source creates glare and shadows; distributed sources at lower output create even, comfortable light. For recessed layouts and spacing math, see the Recessed Lighting Buying Guide.
Shop by spec, not by box marketing: NEXLEDS · EiKO lighting · LED downlights. Maple lists lumens, CCT, and CRI on product pages — and as an authorized reseller, what's in the box matches the spec sheet.
Common lumens/watts mistakes
- Buying "100W equivalent" when the room needed double the lumens
- Comparing LED wattages across brands (efficiency differs — compare lumens)
- Ignoring CRI, then blaming the paint colour
- Replacing a dimmable incandescent with a non-dimmable LED (why that flickers)
- Mixing "equivalent" bulbs from different brands in one fixture — slightly different lumens and CCT = mismatched look
Frequently asked questions
How many lumens is a "normal" light bulb?
The classic 60W incandescent ≈ 800 lumens. That's the everyday reference point.
Do more watts mean brighter with LEDs?
Only loosely, and only within one product line. Between brands, efficiency differs — always compare lumens.
What does "lumens per watt" mean?
Efficiency: how much light per unit of power. Higher is better; ENERGY STAR–certified products meet verified minimums.
Why does my new LED seem dimmer than the old bulb it replaced?
Usually a lumen mismatch (the "equivalent" was optimistic), a directional bulb pointing the wrong way, or an old bulb you remembered brighter than it was.
Are higher-lumen bulbs more expensive to run?
Slightly — but LED running costs are small. A 1,600-lumen LED uses roughly what two 800-lumen LEDs use. Buy the brightness the room needs.
- ENERGY STAR Canada — certified lighting: natural-resources.canada.ca/energy-efficiency/energy-star-canada
- Natural Resources Canada — lighting efficiency: natural-resources.canada.ca
- Manufacturer photometric datasheets for stocked products
Send Maple your room dimensions — we'll do the lumen math and spec the fixtures. Ask Maple
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