High Power "Star" LEDs

High power star LEDs are watt-class emitters pre-mounted on 20mm aluminum-core star PCBs, designed for applications where standard 20mA indicator LEDs simply cannot produce enough light. We carry star LEDs in two power classes: 1 watt star LEDs running at 300–350mA, and 3 watt star LEDs running at 600–700mA. Both use the same standardized 20mm star board footprint, making them interchangeable on the same heatsink and compatible with aftermarket optics, reflectors, and lens holders. Star LEDs are the building blocks of custom flashlights, architectural accent lighting, reef aquarium arrays, stage and DJ lighting rigs, UV curing stations, and high-power indicator arrays in industrial equipment.

Why the aluminum star PCB matters: High power LED dies generate significant heat at the junction — a 3W emitter at 700mA dissipates roughly 2–2.5W as thermal energy. A standard FR4 fiberglass PCB is a poor thermal conductor and would allow junction temperatures to climb into destructive territory within minutes. The aluminum-core star PCB conducts heat laterally across the board and downward into whatever heatsink it is mounted to. The star shape provides mounting holes at the tips that accept M2 or M3 screws for bolting directly to a heatsink surface, with thermal paste or a thermal adhesive pad in between. This thermal path — die to aluminum star to heatsink to ambient air — is what keeps the LED within its safe operating temperature range and maintains rated lumen output over thousands of hours. Without adequate heatsinking, even the best high power LED will dim progressively and eventually fail from thermal degradation of the phosphor and die bond.

Flashlight and spotlight builds: The custom flashlight community on forums like BudgetLightForum and CandlePowerForums frequently uses star-mount LEDs as drop-in emitter upgrades for P60 hosts, Maglite conversions, and scratch-built aluminum flashlight bodies. A 1W cool white star LED paired with a smooth reflector or TIR optic lens produces a tight, punchy beam suitable for an everyday-carry flashlight. A 3W star LED pushes 200+ lumens for a significantly brighter throw. Red and green star LEDs serve as tactical and hunting flashlight emitters — red preserves night vision, green is used for hog hunting and blood trailing. UV star LEDs (365–405nm) power mineral fluorescence flashlights, scorpion detection, and forensic inspection tools.

Reef aquarium and grow lighting: Reef aquarium builders use arrays of royal blue (450–470nm) and cool white star LEDs to create coral growth spectra optimized for photosynthetic zooxanthellae. The 20mm star format makes it straightforward to build custom LED arrays on a flat aluminum heatsink bar — drill and tap mounting holes at 25–30mm spacing, bolt the stars down with thermal paste, wire them in series or series-parallel strings, and drive them with a constant-current driver. Blue and UV LEDs promote coral fluorescence; cool white and warm white fill in the visible spectrum for viewing aesthetics. Indoor plant growers use red (620–660nm) and blue (450nm) star LEDs in DIY grow panels, often supplemented with warm white for a broader photosynthetically active radiation (PAR) spectrum. The high efficiency of star LEDs over fluorescent tubes means less heat and lower electricity costs for the same usable photon output.

Stage, DJ, and architectural lighting: 3W star LEDs are the emitters inside many commercial and DIY stage wash lights, par cans, and architectural accent fixtures. RGB arrays of red, green, and blue 3W stars driven by PWM controllers produce full-color mixing for stage washes, DJ booth effects, and architectural facade lighting. Amber and warm white stars supplement RGB for a wider gamut and better skin-tone rendering in theatrical applications. The 20mm star footprint allows tight packing on a common heatsink plate — a typical 12-emitter RGB par can uses four red, four green, and four blue 3W stars in a circular array behind a diffuser lens. UV (395–405nm) 3W stars power blacklight effects for glow-party events, escape rooms, and haunted house attractions where fluorescent paint and costumes need strong UV excitation over a wide area.

Driving star LEDs — constant current is key: Unlike standard 20mA LEDs that are safely driven through a simple current-limiting resistor, star LEDs at 300–700mA strongly benefit from a dedicated constant-current LED driver. A constant-current driver holds the current steady regardless of supply voltage fluctuations and the LED’s own forward voltage drift as it heats up. This prevents overcurrent damage and ensures consistent brightness. For a single 1W star LED, a 350mA constant-current driver or a buck-type LED driver module is ideal. For a series string of multiple stars, choose a driver whose output voltage range exceeds the total Vf of the string (e.g., three 3V white stars in series = 9V, so a 350mA driver rated for 9–12V output). A resistor can technically work for short-duration or experimental use, but the power wasted as heat in the resistor is significant at these current levels, and the current regulation is poor. Use our LED resistor calculator to size a resistor if you choose that route.

Choosing between 1W and 3W: 1W star LEDs are the better starting point for most builds. They produce 80–130 lumens with manageable heat output that a small passive heatsink can handle. Thermal design is simpler, driver requirements are easier to meet, and the cost per emitter is lower — making them ideal for multi-LED arrays where you can add more emitters rather than pushing each one harder. 3W star LEDs make sense when you need maximum output from the fewest emitters — a single-emitter flashlight, a compact UV curing wand, or a stage light where space constrains the number of stars you can fit. The 3W format also offers the highest available output in colors like royal blue and UV where maximum photon flux per emitter matters for reef lighting and curing applications. Both formats share the same 20mm star board, so you can prototype with 1W stars and upgrade to 3W on the same heatsink if you need more output. For standard-brightness indicator and hobby lighting, our component LEDs at 20mA are a simpler, no-heatsink solution. If you want zero-complexity wiring, pre-wired LEDs include the resistor on the wire.