At 2 a.m. every security camera on earth faces the same exam: no sun, no shop lights, no street lamp — just whatever infrared the board can push out of a 2.8 * 3.5 mm package. That is why the 2835 SMD LED IR at 850nm has quietly become the workhorse of night vision hardware. It is not the brightest part on the market. It is the one that keeps the picture usable, stable and cheap to build around — night after night.
Why 850nm Wins the Night-Vision Job
Infrared wavelengths look identical on a datasheet and behave very differently in the field. 850nm sits in a narrow band that CMOS sensors still respond to strongly, so a camera keeps genuine contrast instead of a flat grey wash.
- Higher sensor response — roughly 3* the usable signal of 940nm at the same drive current.
- Real detail, not silhouettes — faces, plates and clothing textures stay readable.
- Visible dim red glow — installers can confirm emission with the naked eye during commissioning.
- Lower power per lux — battery doorbells and solar cameras stay inside their budget.
Inside the 2835 IR SMD LED
The 2835 SMD LED IR (810nm / 850nm / 940nm) is a 0.2W surface-mount emitter in a 2.8 * 3.5 * 0.8 mm package, built on San'an or Epistar chips with 99.99% gold wire bonding and lead-free reflow compatibility.
| Parameter |
Symbol |
Value |
Test Condition |
| Wavelength | λd | 850 nm (810 / 940 optional) | IF=60mA |
| Radiant intensity | Ee | 20 mW/sr typ. | IF=60mA |
| Forward voltage | VF | 1.4 – 1.7 V | IF=60mA |
| Viewing angle | 2θ½ | 120° | IF=60mA |
| Package size | — | 2.8 * 3.5 * 0.8 mm | 0.2 W |
| Operating temperature | Topr | −40 ~ +85 ℃ | — |
| Lifespan / packing | — | 50,000 h · 4,000 pcs/reel | RoHS / REACH |
Four Application Scenarios Where It Earns Its Keep
1. Dome and bullet CCTV cameras
A ring of 850nm 2835 emitters around the lens delivers even, low-glare fill out to 15–25 m. The 120° beam overlaps neighbours cleanly, which removes the dark corners installers fight with narrow-angle parts.
2. Battery video doorbells
At 60mA and 1.4–1.7V, a short IR burst costs almost nothing from the cell. Motion-triggered capture stays in colour-detail range instead of a washed-out spotlight look.
3. Access control and face recognition
Structured-light and IR-liveness modules need uniform, jitter-free illumination. The sub-100ns rise time of this emitter keeps frame-to-frame brightness steady, so algorithms see a cleaner depth map.
4. Machine vision and inspection
Print mark detection, bottle-cap inspection and wafer alignment all lean on 850nm because it suppresses ambient light noise while cutting through coloured substrates.
850nm or 940nm? A Quick Decision Table
| Requirement |
Choose 850nm |
Choose 940nm |
| Maximum image detail | Best contrast | Needs 2–3* current |
| Covert installation | Dim red glow visible | Nearly invisible |
| Battery-powered product | Lower drive cost | Higher current draw |
| BOM flexibility | Same 2835 footprint across all three wavelengths — one PCB, three SKUs |
Before You Place the Order: A Five-Point Checklist
- Confirm the wavelength bin — ±10nm drift changes sensor response noticeably.
- Check thermal pad routing; 0.2W is small, but a dense array still needs copper.
- Ask for reel-level consistency — mixing bins in one reel causes visible hot spots.
- Validate reflow profile against lead-free peak temperature.
- Request RoHS / REACH documentation with the shipment for EU and North American channels.
Parts like this rarely win a specification sheet on paper — they win when 40,000 units ship and the field failure rate stays near zero. That consistency is what 东莞市蓝晋光电有限公司 (Dongguan Lanjin Optoelectronics Co., Ltd.) has been building since 2005: 18+ years of LED packaging, 80–90% of output exported, 50,000 hours rated life backed by a 3-year warranty, and full custom wavelength, angle and reel service for OEM projects. Their in-house team supports custom LED design from sample to mass production, which is exactly what a night-vision product needs when the sensor, lens and IR ring have to be tuned together.
If your next camera, doorbell or inspection module is still fighting noisy night frames, start with a 2835 IR SMD LED sample reel at 850nm and measure the difference on your own board. Lanjin supplies 4,000 pcs/reel with 5–15 day lead time — enough to prototype, tune, and scale without changing your footprint.
LED lights the world, Lanjin lights your life. Tell us your wavelength, angle and drive current — we will build the reel around it.
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