5mm Diffused Straw Hat LED

5mm diffused straw hat LEDs feature a unique low-profile, wide-brim lens shape that produces the widest beam angle of any standard 5mm through-hole…

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5mm diffused straw hat LEDs feature a unique low-profile, wide-brim lens shape that produces the widest beam angle of any standard 5mm through-hole LED — typically 120–140°. The "straw hat" name comes from the lens profile: a broad, flat brim with a very low dome, resembling the shape of a wide-brimmed hat when viewed from the side. The colored diffused lens scatters light even further than the already-wide physical beam angle, producing an ultra-wide, uniform glow with no hotspot. The tinted lens matches the emitter color, making the LED identifiable by color even when unpowered. This combination of extreme viewing angle, low vertical profile, and diffused glow makes the 5mm straw hat LED ideal for backlighting panels, edge-lit displays, dashboard instrumentation, ambient lighting, and any application where you need maximum light coverage from a single LED with minimal vertical height.

Backlighting and display applications: The straw hat LED's wide beam angle is specifically designed for backlighting. When placed behind a translucent panel, sign, or display surface, a single straw hat LED illuminates a much wider area than a round-top or flat-top LED of the same size. This means fewer LEDs are needed to achieve uniform backlighting — saving space, wiring, and cost. Edge-lit acrylic signs, backlit instrument panels, custom light boxes, and illuminated display cases all benefit from the straw hat's wide-angle output. The low vertical profile means the LED can be mounted close to the panel surface without creating a visible hotspot, which is a common problem with round-top LEDs mounted too close to a diffuser.

Dashboard and automotive gauge lighting: Automotive customizers use 5mm straw hat LEDs behind gauge clusters, switch panels, and dashboard overlays. The extra-wide beam fills the area behind a gauge face more evenly than a round-top LED, eliminating the bright-center-dark-edges pattern. The low profile allows the LED to sit in shallow dashboard cavities where a standard round-top LED would protrude. The colored tint also adds a mild color filter effect, reinforcing the emitted color for richer gauge illumination. Warm white straw hats recreate the vintage incandescent dashboard glow; blue and green straw hats produce the modern custom gauge lighting look popular in car audio and racing builds.

Model railroad, terrain, and ambient effects: Model railroaders use 5mm straw hat LEDs for wide-area lighting applications: freight yard floodlights, large building interiors, station platform illumination, and under-table layout lighting. The wide beam means each LED covers a larger area, reducing the number of LEDs needed to light a scene. Terrain builders wire straw hat LEDs into large terrain pieces where the LED is hidden below a surface and needs to cast light over a broad area above. The low profile helps when vertical clearance under terrain surfaces or inside structures is limited. If you need the straw hat shape with a neutral milky white lens for embedded lighting, see our 5mm diffused straw hat frosted LEDs.

Straw hat vs. round-top vs. flat-top — when to choose each: All three lens shapes in the 5mm diffused lineup share the same electrical specs: same forward voltage by color, same 20mA max, same resistor values. The choice is entirely about beam pattern and physical profile. Straw hat produces the widest beam (120–140°) with the lowest profile — best for backlighting and wide-area illumination. Flat-top produces a wide beam (100–130°) with a flush upper surface — best for panel-mount indicators that need to sit level. Round-top produces a standard wide beam (100–120°) with the classic domed shape — the all-purpose default. If maximum angular coverage is your priority, straw hat is the clear winner.

Colors, wavelengths, and electrical specifications: Available in red, orange, amber, yellow, green, blue, warm white, cool white, UV, and pink. Each product page lists peak emission wavelength in nanometers. Forward voltage: red/orange/yellow/amber ≈ 2.0–2.2V; blue/green/white/UV ≈ 3.0–3.2V. Maximum forward current: 20mA. A current-limiting resistor is required in series. Use our LED resistor calculator for the correct value. The straw hat body fits a standard 5.1mm (13/64″) panel-mount hole but sits lower than a round-top once mounted. The longer lead is the anode (+); the shorter lead is the cathode (−).

Power sources and related categories: For AC transformers, DCC track voltage, or 12V landscape wire, add a bridge rectifier and smoothing capacitor to convert to clean DC. See the AC/DCC wiring guide. For the straw hat shape with a milky white neutral lens, see 5mm diffused straw hat frosted LEDs. For a taller profile with a standard dome, see 5mm diffused round-top. For a flush-mount profile, see 5mm diffused flat-top. For maximum on-axis brightness, clear-top 5mm straw hat LEDs produce the tightest beam in this shape. New to LEDs? Pre-wired LEDs include the resistor on the wire.

A straw hat LED has a low-profile, wide-brim lens that resembles a flat hat when viewed from the side. It produces the widest beam angle (120–140°) of any standard 5mm LED and sits much lower above the PCB than a round-top. Round-top LEDs have a taller dome that produces a slightly narrower beam (100–120° in diffused variants). Electrically they are identical — same forward voltage, same 20mA max, same resistor requirements.
Typically 120–140° — the widest of any standard 5mm through-hole LED shape. The wide-brim lens combined with the diffused tint produces an ultra-wide, uniform glow ideal for backlighting and wide-area illumination. The exact angle varies by color and is listed on each product page.
The resistor depends on supply voltage and LED color, not the lens shape. A straw hat LED uses the same resistor as a round-top or flat-top LED of the same color at the same voltage. Use our LED resistor calculator for the exact value, or check the product page resistor table.
Straw hat LEDs fit standard 5.1mm (13/64″) panel-mount holes. However, the wide brim of the lens may not seat correctly in some snap-in LED holders designed for round-top profiles. Test-fit before committing to a holder. For panel mounting, a simple drilled hole with a friction fit works well given the low profile of the straw hat shape.
Colored straw hat LEDs have a tinted lens visible when on or off — useful for indicators and colored backlighting. Frosted straw hat LEDs have a milky white lens that appears neutral when off — preferred for embedded lighting and builds where the LED should be invisible when unpowered. Both have the same wide beam angle and electrical specs.
LEDs require DC. For AC or DCC power, add a bridge rectifier and smoothing capacitor. See our AC/DCC wiring guide for the complete diagram.