Choosing the right downlight size is one of the most common confusions in LED lighting. Here's a practical guide to cutout sizes and when each makes sense.
The Three Common Sizes
| Cutout Size | Best For | Typical Wattage |
|---|---|---|
| 30mm (1.2") | Accent lighting, display niches, cabinets | 1-3W |
| 60mm (2.4") | General room lighting | 5-9W |
| 90mm (3.5") | High ceilings, commercial spaces | 12-20W |
30mm: Small but Mighty
Tiny 30mm cutout lights are perfect for accent and task lighting: jewelry displays, bookshelves, hallway niches, under-cabinet spots. Our COB LED Recessed Downlight series covers this range with anti-glare optics and high CRI color rendering.
How to Measure Your Existing Cutout
If you're replacing old downlights, measure the diameter of the hole in the ceiling, not the trim. Add 2-3mm for the spring clip clearance when ordering.
Key Specs to Check
- Beam angle: 24-38 degrees for general lighting, 60+ for washing walls
- CRI: Look for 90+ for accurate colors, especially in kitchens and bathrooms
- Dimmability: Not all LEDs dim well - check compatibility with your dimmer
- IP rating: Bathroom zones 1-2 need IP44+, outdoors needs IP65+
Get the size right first, then worry about brightness and color. The physical fit determines everything else.