How to Choose LED Bulbs: Lumens, Color, and CRI
Watts don't mean anything anymore. Here's how to actually pick LED bulbs — how bright (lumens), what color (Kelvin), how true the colors look (CRI), and the details that separate a bulb you love from one you'll want to return.
⚠️ Before you start
- Check the fixture's maximum wattage rating, but know LEDs draw far less — a 60W-equivalent LED uses about 9 watts, so you can safely get bright light in low-rated fixtures.
- For enclosed fixtures (globes, recessed cans with trims), buy bulbs rated 'enclosed fixture rated' — trapped heat shortens the life of bulbs that aren't.
- For dimmers, buy bulbs marked dimmable and, ideally, matched to a compatible LED dimmer to avoid flicker.
The old way to buy a bulb was easy: you bought a "60-watt." That number measured how much energy it burned, which happened to track brightness. LEDs broke that link — they sip power — so watts are now meaningless as a brightness guide. Here's what actually matters.
1. Brightness = lumens
Lumens measure light output. Learn a few anchor points and you'll never guess again:
- 800 lumens ≈ the old 60-watt bulb (most lamps and fixtures)
- 1100 lumens ≈ 75-watt
- 1600 lumens ≈ 100-watt (kitchens, workspaces)
Buy for the job: cozy corner lamp, less; kitchen or garage, more.
2. Color = Kelvin
The Kelvin number sets the mood of the light:
- 2700K — warm, yellowy, that classic incandescent glow. Bedrooms, living rooms.
- 3000–3500K — soft-to-neutral white. Versatile.
- 4000K — neutral, clean. Kitchens, baths, laundry, garages.
- 5000K — crisp daylight blue. Workshops and task areas.
The single biggest mistake people make is mixing temperatures — a 2700K lamp next to a 5000K ceiling light looks broken. Pick a temperature per room (or per whole home) and stay consistent.
3. Quality = CRI
Here's the spec the cheap bulbs hide: Color Rendering Index, a 0–100 score of how true colors look under the light. An 80-CRI bulb makes food, skin, and paint look slightly gray and off. A 90+ CRI bulb makes everything look right. It's worth paying for anywhere color matters — kitchens, bathrooms, closets, dressing areas. Look for 90+ CRI LED bulbs specifically.
Don't-forget details
- Dimming: buy bulbs marked dimmable, and if they flicker, the fix is usually a LED-compatible dimmer — see our guide on why LED bulbs flicker on a dimmer.
- Enclosed fixtures: globes and closed cans trap heat. Use bulbs marked enclosed fixture rated or they'll die early.
- Shape and base: match the old bulb's shape (A19, BR30 flood, candelabra) and base size so it fits and looks right.
The quick version
Pick your lumens for brightness, one Kelvin temperature per room, and 90+ CRI wherever color matters. Get those three right and you'll actually enjoy your lighting — for a decade, on a few watts.
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Frequently asked questions
How bright is bright? What replaces a 60-watt bulb?
Look at lumens, not watts. Rough equivalents: 450 lumens ≈ old 40W, 800 lumens ≈ 60W, 1100 lumens ≈ 75W, 1600 lumens ≈ 100W. A living room lamp is happy around 800 lumens; a kitchen or workspace wants more.
What color temperature should I buy?
Kelvin (K) sets the mood. 2700K is warm and yellowy, like the old incandescent glow — great for bedrooms and living rooms. 3000K is a slightly crisper warm white. 3500–4000K is neutral, good for kitchens, baths, and garages. 5000K is daylight-blue and best for workshops. Pick one temperature and stick with it room to room so your home doesn't look mismatched.
What's CRI and should I care?
Color Rendering Index measures how true colors look under the light, on a scale to 100. Cheap LEDs can be 80 CRI and make food, skin, and paint look a little off. Look for 90+ CRI where color matters — kitchens, bathrooms, closets, and anywhere you get dressed. It's one of the biggest quality differences and it's often not on the front of the box.
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