LED Lighting Guide: Lumens, Kelvin & Where to Use Them
Key takeaways
- Lumens measure brightness; watts measure energy use. Shop by lumens.
- 60W incandescent ≈ 800 lumens; 100W ≈ 1600 lumens.
- Kelvin sets the colour: 2700K warm white, 3000K soft white, 5000K daylight.
- Layer ambient, task and accent lighting rather than one bright source.
Lumens vs watts
Old bulbs were sold by watts (energy). LEDs use far less energy for the same light, so shop by lumens (brightness) instead. Quick equivalents: 40W ≈ 450 lm, 60W ≈ 800 lm, 75W ≈ 1100 lm, 100W ≈ 1600 lm. An LED hits those numbers using about 80–85% less power.
Colour temperature (Kelvin)
- 2700K warm white — cozy living rooms and bedrooms.
- 3000K soft white — kitchens, bathrooms, dining.
- 4000K neutral/cool white — garages, workshops, laundry.
- 5000K daylight — task lighting, basements, security.
How much light does a room need
Multiply the room's area by a target light level: living rooms ~10–20 lumens per sq ft, kitchens ~30–40, bathrooms ~70–80. A 12×12 ft kitchen (144 sq ft) at 35 lm/sq ft needs about 5,000 lumens total — best split across several fixtures.
Outdoor & smart options
For outdoors, look for an IP65 (or higher) rating so the fixture handles rain and dust, and consider dusk-to-dawn or motion-sensor units for security. Smart bulbs add app and voice control and let you tune brightness and colour to the time of day.
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Frequently asked questions
How many lumens do I need to replace a 60W bulb?
About 800 lumens. Look for that number on the LED package rather than the wattage.
What's the difference between warm white and daylight?
Warm white (2700K) has a cozy yellow tone; daylight (5000K) is a crisp blue-white. Soft white (3000K) sits in between.
What IP rating do outdoor lights need?
At least IP65, which means dust-tight and protected against water jets. For very exposed or wet spots, choose IP66 or IP67.
Product information is for general reference only. Specifications, finishes and compatibility can vary — always check the manufacturer’s listing and instructions. For electrical, plumbing, gas or structural work, follow your local building and electrical codes and use a licensed professional where required.