Diffused vs Clear LED: Which Lens Type Should You Choose?
Quick answer: choose diffused LEDs when the viewer looks at the indicator itself from any angle; choose water-clear (transparent) LEDs when you need maximum on-axis brightness or a defined beam, e.g. into a light pipe or across a distance.
How They Differ
| Diffused (milky) lens | Water-clear lens | |
|---|---|---|
| Beam | Wide, soft, 60-120° | Narrow, focused, 15-30° |
| On-axis punch | Lower | Higher mcd at same current |
| Off-axis readability | Excellent | Poor — dims quickly |
| Glare | Low | Can dazzle up close |
Selection Rules
- Panel indicator viewed directly: diffused — readable from the side, no glare.
- Light pipe input: wide-angle diffused feeds pipes more evenly; clear only with texture/gap compensation.
- Long viewing distance / daylight: clear, narrow beam maximizes visible intensity.
- Backlighting legends: diffused, to avoid seeing the die image through the panel.
Watch the Spec Sheet Trap
mcd numbers are not comparable across lens types: a clear 8000 mcd narrow-beam LED and a diffused 400 mcd wide LED can look equally bright at the panel. Compare viewing angle and test current alongside mcd.
Need datasheets, samples or a bulk quote? Browse our LED datasheet center or product center. Hongcheng Optoelectronics, a member of Guangyu Group, has 20+ years of LED packaging experience with A-grade chips and 99.99% pure gold wire bonding.
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