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| Size | 3mm Round Top Alternating Flashing LED |
|---|---|
| Color | Blue / Red |
| Luminosity/Brightness | 6,000-7,000 mcd |
| Forward Voltage | 2.9-3.1 |
| Current | 20mA |
| Wavelength | N/A |
| Viewing Angle | 20-30 Degrees |
| Mount Style | Through Hole (DIP) |
| Lens Color | Clear |
| LED Brightness Class | Super/Ultra/Extreme |
| Animation Type | Flashing / Blinking Alternating 1.5hz |
Lighthouse LEDs has been providing top quality components for over 20 years and have become the go-to supplier for many industries through Ebay and our personal website, where there is more ordering flexibility and products offered. If you need resistors, wire, heatshrink, switches or LED drivers you can find them at those links. We have, perhaps, the best and widest selection of LEDs out there!
These 3mm blue/red alternating flashing LEDs are built for police-style lighting effects — the dual-color, 1.5Hz automatic flash cycle is self-contained in the LED itself, no external controller needed.
Each LED runs at a forward voltage of 2.9–3.1V at 20mA and emits at a very bright 6,000–7,000 mcd through a clear round-top lens with a focused 25° viewing angle. The 3mm DIP package fits a standard 3mm drill hole, and the built-in alternating flash switches between blue and red automatically on DC power.
Common applications
- RC police car builds: Drill through polycarbonate body shells with a 3.2mm (1/8") bit — pairs perfectly with 1:10 scale cruiser builds, Traxxas TRX-4 police editions, and custom Tamiya body conversions
- Model railroad emergency scenes: Police cars and fire scenes in HO (1:87) and N scale (1:160) layouts — Walthers and Atlas emergency vehicle kits benefit from this self-flashing blue/red effect without any timing circuitry
- Miniature gaming terrain: Alarm beacons, police drone effects, and sci-fi Warhammer 40K Arbites vehicles — the alternating pattern reads clearly on tabletop scale
- Diorama and scale model scenes: 1:35 and 1:72 military/civilian dioramas depicting police or emergency response scenarios
- Halloween props and costume builds: Siren light effects for wearables, display boxes, and prop weapons requiring a police flasher effect
- Electronics prototyping and indicator panels: Status indicators where a dual-color alternating alert signal communicates urgency without added logic
Wiring & power notes
Animated LEDs (flashing, flickering, fading) require DC — they will not operate correctly on AC power. If you are working from a low-voltage AC source such as a model railroad transformer or DCC output, convert to DC first with a MB1S bridge rectifier paired with a 100µF 50V electrolytic capacitor for smoothing. Without the capacitor, the animation pattern may glitch on the pulsed DC output of a bare rectifier.
Do animated LEDs work on AC power?
| Power Source | Bridge Rectifier | 100µF Capacitor |
|---|---|---|
| DC power supply | No | No |
| 12V AC landscape transformer | Required | Required |
| DCC track power | Required | Required |
Animated LEDs require DC. Convert AC sources to DC using a bridge rectifier plus a 100µF smoothing capacitor for clean, ripple-free animation.
Resistor quick reference — 2V LEDs (red, orange, yellow, amber) at 20mA:
| Supply Voltage | Resistor | Power Rating |
|---|---|---|
| 3V | 56Ω | 1/4W |
| 4V | 100Ω | 1/4W |
| 5V | 150Ω | 1/4W |
| 6V | 200Ω | 1/4W |
| 7V | 270Ω | 1/4W |
| 8V | 300Ω | 1/4W |
| 9V | 360Ω | 1/4W |
| 10V | 430Ω | 1/4W |
| 11V | 470Ω | 1/4W |
| 12V | 510Ω | 1/4W |
| 13V | 560Ω | 1/2W |
| 14V | 620Ω | 1/2W |
| 15V | 680Ω | 1/2W |
Prefer not to calculate resistor values? Our 20mA LED Current Limiter eliminates the math entirely. Active constant-current drive to 20mA across a 4–45V DC supply — ideal for automotive circuits where voltage fluctuates. Multiple LEDs in series share one driver.
Building with this item
Need supporting components? These pair directly with this listing:
- Panel mount holder (Black): 3mm LED Holder/Bezel (Black) — through-panel bezel with lock ring and insert
- Panel mount holder (Chrome): 3mm LED Holder/Bezel (Chrome) — silver/chrome finish alternative
Quality LEDs made in the USA since 2005.
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