1 Watt Star LEDs

1 watt star LEDs are the most accessible watt-class emitters for custom lighting builds. Each LED chip is factory-soldered to a 20mm aluminum-core star PCB that provides both electrical connection pads and a thermal heat-spreading path. Running at 300–350mA with a forward voltage of 2.0–3.6V depending on color, a single 1W star LED produces 80–130 lumens — roughly equivalent to a small halogen accent bulb and dramatically brighter than any standard 20mA through-hole LED. We stock 1W star LEDs in red, orange, amber, yellow, green, blue, cool white, warm white, natural white, UV, and infrared. Each product page lists the exact peak wavelength or color temperature, forward voltage at rated current, luminous flux, and viewing angle.

Flashlight builds: The custom flashlight community is one of the largest markets for 1W star LEDs. A single cool white 1W star paired with a smooth aluminum reflector and a single-cell lithium battery creates a compact, efficient everyday-carry flashlight that outperforms most commercial keychain lights. The 20mm star PCB drops directly onto the heatsink pill of standard P60-compatible flashlight hosts, Maglite conversion modules, and custom-machined aluminum bodies. Cool white (5500–6500K) produces the highest perceived brightness and sharpest beam definition; warm white (3000–4000K) renders colors more naturally and is preferred for outdoor and camping use where accurate color vision matters. Red 1W stars serve as astronomy flashlights (preserving night-adapted vision) and hunting/tactical lights. Green is popular for hog hunting, blood tracking, and night fishing. UV stars (395–405nm) power mineral fluorescence flashlights, scorpion hunting, and forensic evidence detection.

Architectural and accent lighting: Interior designers and custom lighting builders use arrays of 1W star LEDs in recessed housings, under-cabinet fixtures, cove lighting channels, and display case lighting. The 20mm star format allows precise placement on a heatsink bar at any spacing — drill and tap mounting holes at 25–30mm intervals for a continuous linear wash, or space them farther apart for individual accent spots. Warm white stars (3000–4000K) create the inviting glow expected in residential and hospitality settings; natural white (4000–4500K) suits retail displays and art gallery lighting where accurate color rendering matters. Unlike standard LEDs that produce milliwatts of output, 1W stars produce enough lumens per emitter to serve as functional room accent lighting, not just decorative dots.

Reef aquarium and planted tank lighting: Coral reef aquarium builders use arrays of royal blue (450–470nm) and cool white 1W star LEDs to create a balanced spectrum for coral growth and viewing aesthetics. Blue light drives photosynthesis in the zooxanthellae algae within coral tissue, while white light provides the full visible spectrum for the aquarist to assess coral color and health. UV stars (395–405nm) added at low power levels promote coral fluorescence for dramatic visual effects during moonlight viewing. The 1W format is preferred over 3W for reef builds where a large number of evenly spaced emitters creates more uniform light distribution across the tank, with each emitter running cooler and more efficiently than fewer, harder-driven 3W chips.

Thermal management: Every 1W star LED requires a heatsink. The aluminum star PCB spreads heat away from the die, but it cannot dissipate 0.7–0.8W of thermal energy into still air alone. Bolt the star to a flat aluminum heatsink surface using M2 or M3 screws with thermal paste or a thermal pad in between. For a single 1W star, a small passive heatsink (25×25mm finned block or a flat aluminum plate of similar area) is sufficient. For arrays of multiple stars on a common heatsink bar, allow at least 20cm² of heatsink surface per emitter and ensure adequate airflow across the fins. In enclosed fixtures, consider adding a small fan. The star’s mounting holes make thermal management straightforward — this is one of the reasons the star format dominates the DIY high power LED market.

Driving 1W star LEDs: A constant-current LED driver rated at 350mA is the recommended way to drive 1W star LEDs. The driver maintains precise current regardless of supply voltage fluctuations and the LED’s own Vf shift as it heats up. For a single star, a simple 350mA buck driver module is compact and inexpensive. For a series string of stars (preferred wiring method), add the individual Vf values and choose a 350mA driver with adequate output voltage range. A resistor can work for short-term testing or experimental purposes, but wastes significant power as heat — at 12V with a 3V white star, the resistor dissipates 3.15W vs. the LED’s 1W. Use our LED resistor calculator if you go the resistor route. For AC power sources, add a bridge rectifier and capacitor first — see the AC/DCC wiring guide.

Related categories: For higher output per emitter, 3W star LEDs run at 600–700mA on the same 20mm star board with approximately twice the lumen output but proportionally higher thermal requirements. For maximum single-module output, 10W LEDs produce 800–1200 lumens. For a brighter through-hole LED that requires no heatsink, the 0.5W DIP high power LEDs bridge the gap between standard 20mA indicators and watt-class emitters. For standard indicator brightness, browse clear top DIP LEDs and diffused LEDs in our component LEDs catalog. New to LEDs? Pre-wired LEDs are the easiest starting point — the resistor is already built in.