3 Watt Star LEDs

3 watt star LEDs are the highest output per-emitter star-mount LEDs we carry, running at 600–700mA on the same standardized 20mm aluminum-core PCB used by 1W star LEDs. A single 3W star produces 150–260+ lumens depending on color and efficiency class — roughly twice the output of a 1W star and enough to serve as a primary light source in focused applications. We stock 3W star LEDs in red, orange, amber, yellow, green, blue, cool white, warm white, natural white, UV, and infrared. These are the emitters used in high-performance flashlights, reef aquarium arrays, stage and DJ wash lights, UV curing tools, and architectural spotlight fixtures where maximum lumen output from a single point source matters.

High-output flashlight builds: The 3W star LED is the standard emitter for serious flashlight builds where maximum beam intensity and throw are the primary objectives. A cool white 3W star at 700mA behind a deep smooth reflector produces a focused hotspot with substantial throw for search and rescue, security patrol, and outdoor exploration. The 20mm star PCB seats directly on the heatsink pill of flashlight hosts designed for star-mount emitters — P60 drop-in modules, custom aluminum pill assemblies, and Maglite conversion kits. Warm white 3W stars are preferred by outdoorsmen for camping, hiking, and hunting because warm color temperatures render natural colors (foliage, soil, animal fur) more accurately than the blue-shifted output of cool white. Green 3W stars are favored for night hunting — green light is highly visible to humans but less alarming to many game animals. UV 3W stars (395–405nm) create powerful blacklight flashlights for mineral collecting, scorpion detection, and forensic inspection.

Reef aquarium and coral growth: Royal blue (450–470nm) 3W star LEDs are the backbone of DIY reef aquarium lighting systems. Coral reefs in nature exist under intense blue light filtered through meters of seawater, and the zooxanthellae photosynthetic algae within coral tissue respond most strongly to wavelengths in the 440–480nm range. Reef builders mount arrays of royal blue and cool white 3W stars on aluminum heatsink bars above the tank, wiring each color in separate series strings for independent intensity control via PWM dimming. A typical 24-inch reef tank might use six to eight 3W stars (four blue, two cool white, one UV, one warm white) driven at 60–80% of rated current for a good balance of output, efficiency, and thermal headroom. UV 3W stars at low intensity promote dramatic coral fluorescence during blue-light-only moonlight viewing sessions. The 3W format is preferred over 1W for reef builds where the tank requires fewer, higher-output emitters to reach target PAR levels at the coral surface, typically 18–24 inches below the light.

Stage, DJ, and architectural lighting: 3W star LEDs are the emitters inside many commercial LED par cans, wash lights, and architectural spotlights. A circular array of twelve 3W stars (four red, four green, four blue) behind a diffuser lens creates an RGB wash light capable of full-spectrum color mixing for stage performances, DJ booths, nightclub installations, and event lighting. Each color channel is driven by its own constant-current driver with PWM dimming, allowing smooth color fades and transitions. Amber and warm white 3W stars supplement RGB for extended-gamut color rendering — RGBW and RGBA configurations produce skin-tone-friendly warm washes that pure RGB mixing cannot achieve. For theatrical spot applications, a single cool white 3W star behind a TIR optic or reflector creates a focused accent beam for highlighting stage elements, art pieces, and architectural features.

UV curing and specialized applications: UV 3W star LEDs (365–405nm) produce concentrated ultraviolet irradiance suitable for curing UV-set adhesives, dental composites, nail gel polish, and UV-curable coatings. The 3W output level delivers enough radiant flux at the target wavelength to cure most UV adhesives within seconds at close working distance (10–30mm). Paired with a focusing TIR lens (8–15°), a single UV 3W star creates a compact spot-curing wand for precision bonding in electronics assembly, jewelry making, and medical device manufacturing. Infrared 3W stars (850nm or 940nm) power night vision illuminators for security cameras and wildlife observation systems — invisible to the naked eye but bright in the near-IR spectrum detected by CMOS camera sensors.

Thermal management for 3W stars: At 600–700mA, a 3W star LED dissipates approximately 2–2.5W as thermal energy. This is twice the heat output of a 1W star and requires a proportionally more capable thermal solution. For a single 3W star, use a finned aluminum heatsink of at least 40×40mm with thermal paste between the star board and heatsink surface. For multi-emitter arrays, allocate at least 30cm² of heatsink surface per 3W star and ensure cross-ventilation. Enclosed fixtures should include active fan cooling for continuous duty operation. The aluminum star PCB provides excellent lateral heat spreading, but the heatsink behind it must have enough surface area to dissipate the thermal load to ambient air. Underthermed 3W stars will dim noticeably within minutes of power-on as the junction temperature climbs — if your array dims after initial brightness, the heatsink is undersized.

Driving 3W star LEDs: A constant-current LED driver at 700mA (or the specific rated current listed on the product page) is the correct way to drive 3W star LEDs. The driver holds current steady as Vf shifts with temperature, protecting against thermal runaway and maintaining consistent lumen output. For a series string of same-color stars, sum the Vf values and choose a driver with matching current and sufficient voltage headroom. A resistor is not recommended at 700mA — the power dissipated in the resistor exceeds what the LED itself draws, wasting energy and making thermal management harder. Use our LED resistor calculator only for quick bench testing. For AC inputs, convert to DC first with a bridge rectifier — see the AC/DCC wiring guide. For simpler, lower-power projects, see our component LEDs at 20mA or pre-wired LEDs.