10mm Round Top LED

10mm round-top LEDs are the largest standard through-hole LED size, designed for applications where the LED body itself needs to be visible from a…

Read full description & FAQ ↓

9 Items

10mm round-top LEDs are the largest standard through-hole LED size, designed for applications where the LED body itself needs to be visible from a distance or must physically fill a larger mounting hole. At 10mm diameter, these are the go-to choice for G-scale model railroad headlights and signals, 1:10 scale RC vehicle lighting, large panel-mount indicators on industrial and marine equipment, escape room prop panels, model lighthouse beacons, and high-visibility status displays on custom enclosures. We stock 10mm clear round-top LEDs in 9+ colors including red, orange, amber, yellow, green, blue, cool white, warm white, UV, and pink.

Scale modeling and RC applications: G-scale (1:22.5) and garden railroad modelers use 10mm LEDs for locomotive headlights, station platform lamps, and grade crossing signals — at this scale, the 10mm body represents a proportionally correct light fixture. Cool white is the standard for modern diesel headlights; warm white works for older steam-era lanterns. For 1:10 and 1:8 scale RC crawlers and trucks (Traxxas TRX-4, Axial SCX10 III, Redcat Gen8), a 10mm LED represents a realistic 100mm (4-inch) headlight — bright enough to be functional on night trail runs, not just decorative. Red for taillights, amber for turn signals, and white for headlights. The clear lens focuses the beam forward, mimicking how a real headlight reflector concentrates light into a spot pattern. Lighthouse hobbyists pair a 10mm white or warm white LED with a 555 timer circuit or slow PWM from an Arduino to create a realistic pulsing or rotating beacon flash inside a scale lantern housing.

Escape rooms, displays, and industrial panels: Escape room designers and puzzle-panel builders use 10mm LEDs as solve-state indicators — the large illuminated surface is readable from across a dim room without squinting. Green for “solved,” red for “locked,” and blue or amber for “active hint available.” Haunted attraction builders use red and UV 10mm LEDs for high-visibility eye effects in large animatronic skulls, demon heads, and wall-mounted gargoyle props where a 5mm LED would not fill the eye socket. For industrial control panels and marine instrument dashboards, the 10mm body matches standard panel-mount cutout sizes found in legacy equipment, making them a direct replacement for incandescent pilot lights.

Colors, wavelengths, and lens characteristics: All 10mm round-top LEDs in this category have a water-clear lens that focuses light into a forward beam. The wider lens produces a slightly broader beam than a 5mm round-top — typically 20–40° depending on the die placement — while still delivering a concentrated spot pattern. Each product page lists the peak wavelength in nanometers and brightness in millicandela (mcd). White LEDs are available in warm white (~3000–4000K) and cool white (~5500–6500K). UV LEDs (395–405nm) work for blacklight panels in haunted houses and escape rooms where coverage from a single LED needs to span a larger area.

Electrical specs and resistor selection: Forward voltage by color: red/orange/yellow/amber ≈ 2.0–2.2V; blue/green/white/UV ≈ 3.0–3.2V. Maximum forward current: 20mA. The larger lens does not change the electrical specifications — 10mm LEDs use the same resistor values and wiring as 3mm and 5mm LEDs: 510Ω for red at 12V, 470Ω for white/blue at 12V, 150Ω for red at 5V. Use our LED resistor calculator for any supply voltage. For AC-powered applications (G-scale garden railroad transformers, DCC track power, 12V AC landscape wire), add a bridge rectifier and smoothing capacitor to convert to DC. See the AC/DCC wiring guide for a complete diagram. New to LEDs? Pre-wired LEDs include the resistor on the wire — just connect power and ground, no math needed.

Mounting and physical dimensions: The 10mm LED body fits a 10.2mm (13/32″) panel-mount hole. A standard 3/8″ (9.5mm) drill bit is slightly undersized; use a step drill, reamer, or 13/32″ bit for a clean fit. A 10mm LED holder or bezel provides a professional snap-in panel mount. Lead spacing is standard 2.54mm (0.1″) for breadboard and perfboard compatibility. The longer lead is the anode (+); the shorter lead with a flat on the base is the cathode (−). For RC vehicle headlights, hot-glue the LED behind the body shell lens opening and route the lead wires to the receiver’s lighting channel or a separate switch.

Related categories: Need the same 10mm body but wider light distribution? See 10mm diffused LEDs with a frosted lens for 120–160° coverage. For higher brightness in the 10mm package, browse our 10mm 0.5W LEDs driven at 100–150mA. For smaller form factors, 5mm round-top LEDs are the most popular LED size overall, and 3mm round-top LEDs fit HO and N scale models. Want blinking or color-cycling effects without a microcontroller? Browse animated LEDs. For 12V circuits without resistor math, 12V built-in resistor LEDs are a drop-in solution. Multi-color mixing uses RGB LEDs with separate red, green, and blue dies in a single package.

Frequently Asked Questions

The same as 3mm and 5mm LEDs — Vf depends on color, not size. Red/orange/amber/yellow ≈ 2.0–2.2V. Blue/green/white/UV ≈ 3.0–3.2V. The exact Vf is listed on each product page. The 10mm lens is larger but the LED die inside has the same electrical characteristics.
The same resistor values as any standard 20mA LED. At 12V: red ≈ 510Ω, white/blue ≈ 470Ω. At 5V: red ≈ 150Ω, white/blue ≈ 100Ω. Use our LED Resistor Calculator to find the exact value for your supply voltage and LED color.020A. Use our LED resistor calculator for any voltage. The 10mm package does not change the electrical requirements at all.
10mm LEDs fit a 10.2mm (13/32″) panel hole. A 3/8″ drill bit (9.5mm) is slightly undersized and will require filing or reaming; use a step drill or a 13/32″ bit for a clean, friction-fit result. A 10mm LED holder/bezel provides a clean snap-in mount and is the recommended approach for control panels and enclosures.
Not necessarily in terms of total light output. Both sizes run at 20mA and use a similar LED die. The 10mm lens spreads that light over a larger visible area, so the mcd (on-axis intensity) rating may actually be lower than a tightly-focused 5mm round-top. The advantage of 10mm is the physically larger illuminated surface — the LED body itself is part of the visual design in RC headlights, panel indicators, and G-scale railroad signals.
LEDs require DC power. For 12V AC landscape transformers, G-scale garden railroad transformers, or DCC track power, add a bridge rectifier and smoothing capacitor to convert to clean DC. Without rectification, the LED flickers at line frequency and the reverse voltage half-cycle can shorten its lifespan. See our AC/DCC wiring guide for a complete diagram.
Yes — 10mm white or warm white LEDs are a popular choice for garden lighthouse models and nautical dioramas. The large lens body fills the lantern housing convincingly, and the forward-focused beam reads well as a beacon at scale. Pair with a 555 timer oscillator or Arduino PWM output to create a realistic pulsing or rotating flash pattern. For a rotating effect, mount the LED on a slow-turning motor inside the lantern.