The Challenge: Taming Extreme Light
An LED rated at 120,000 lumens and 1.5 kW produces heat comparable to a small space heater — concentrated into a chip no larger than a credit card. Without active cooling, it would self‑destruct in seconds. This project builds a fully portable, battery‑operated system that not only keeps the LED within safe temperatures but also cools the six voltage regulators that drive it. The result is a portable supernova: a light that can ignite matches using visible photons alone, with no infrared component.
Core Components & Materials
6× 360mm copper PC radiators
18× 120mm high‑static‑pressure fans
Brass sheets & box sections (reservoir + brackets)
Custom large‑format copper water block
Arduino Uno + relay bank
Water flow / temp / pump speed sensors
High‑discharge LiPo battery (5 kW peak)
Battery management system (BMS) + data screen
6× 250W constant‑current regulator boards
Brass gears + 6 potentiometers (gear‑coupled knob)
Deep hemispherical lens + large Fresnel lens
Premium coolant (corrosion inhibitors + biocide)
Build Breakdown — Engineering in Stages
Hexagon Radiator Array
4–5 hoursbrass bending
Six copper radiators are joined into a rigid hexagon using custom bent brass brackets and three internal bracing rods. Eighteen fans (three per radiator) deliver massive airflow. The radiators are linked in series, forcing coolant through all six before returning to the LED water block.
- 1Cut brass brackets with a jigsaw using 3D‑printed templates, bend tabs with a vise.
- 2Bolt radiators together, insert copper rods, mount fans in push‑pull orientation.
Dual‑Purpose Brass Reservoir
solderingwatertight
The hexagonal brass reservoir does double duty: stores coolant and actively cools the six voltage regulator boards. Water flows through an outer perimeter channel before entering the central chamber. Each regulator sits against the brass wall via thermal pads, transferring heat directly to the moving coolant.
- 1Bend brass box section into hexagon, solder all seams watertight.
- 2Add acrylic window with gasket and clamping screws.
- 3Mount regulators around the hexagon using thermal pads.
🔧 Thermal synergy
The same water that cools the LED also pulls heat from the power stage — keeping both the chip and its drivers within safe limits.Large‑Format Copper Water Block
A standard CPU water block is too small. This custom block uses a solid copper heatsink with a soldered brass cover that forces water through internal fins. Thermal compound couples the LED’s rear surface, and thick copper clamps provide even mounting pressure. Uniform heat extraction prevents hotspots.
Arduino Safety System
fail‑saferedundant
An Arduino monitors three sensors: water flow rate, coolant temperature, and pump tachometer (RPM). Only when all values stay within safe thresholds does it trigger a relay bank that enables the six voltage regulators. If flow drops, temperature exceeds 50°C, or the pump stalls, relays disconnect power instantly — the LED will not even illuminate until cooling is fully verified.
Portable Power: LiPo + BMS
A high‑discharge lithium polymer battery (5 kW peak) supplies the 1.5 kW draw. A custom brass enclosure is soldered to protect cells, integrating a BMS board with data screen and power button. The battery provides about 15 minutes of full‑brightness runtime — enough for dramatic field demonstrations. Copper pipe brackets mount the pack to the rear radiator structure.
Gear‑Coupled Brightness Controller
mechanical linkage6‑in‑1 knob
Each voltage regulator has a current‑setting potentiometer. Instead of six separate knobs, all potentiometers are mechanically linked via brass gears so they rotate together. A large reduction knob gives precise, weighted control over total brightness. Wiring compensates for gear inversion, making the single knob increase or decrease all six arrays simultaneously.
Two‑Stage Optical Focusing
Raw LED emission is wide‑angle. A deep hemispherical lens captures the broad beam, then a large‑diameter glass Fresnel lens collimates it into a tight, long‑throw spotlight. The concentrated visible light is so intense that it can instantly ignite a match — with no infrared contribution. This dual‑lens system makes the LED SUPERNOVA effective at hundreds of meters.
✨ Photon ignition
Visible light alone heats the match head until combustion occurs — a direct demonstration of extreme energy density.Thermal Validation: 15‑Minute Stress Test
A continuous run at full 1.5 kW in a warm indoor room proved the cooling system’s capability. After 15 minutes, the LED substrate temperature plateaued at 65°C — well below the 85°C maximum rating. Coolant temperature remained at 32–34°C, fans running at only 74% speed. The battery reached 50°C but stayed within safe limits. The system maintains thermal equilibrium indefinitely, providing reliable portable use.
Field Performance & Illumination Power
At night in a forest, the LED SUPERNOVA outshone automotive LED high beams by orders of magnitude. The dual‑lens system throws a clean, intense beam hundreds of meters, revealing foliage and terrain details invisible under conventional lights. The ability to ignite a match from a meter away demonstrates the sheer photon density. Despite the extreme output, the integrated fail‑safes and thermal management ensure safe, repeatable operation.
This build proves that a portable, battery‑powered 1.5 kW LED is not only feasible but can be engineered with accessible tools and metal fabrication techniques — no CNC required.
Frequently Asked Questions
How does the cooling handle 1.5 kW without throttling?▼
Six copper radiators plus eighteen fans provide massive heat exchange. The custom water block extracts heat uniformly, and the brass reservoir cools the regulators. LED substrate stays at 65°C — well under the max rating.
Why can the light ignite a match instantly?▼
The LED emits negligible infrared — ignition is caused purely by intense visible light photons. Dual‑lens focusing creates extreme energy density on the match head.
What safety features prevent LED failure?▼
Arduino monitors flow, coolant temperature, and pump rotation. Any anomaly cuts power via relays. BMS also protects battery against overcurrent, undervoltage, and shorts.
Is the LED SUPERNOVA truly portable?▼
Yes. On‑board LiPo battery provides 15 minutes of full brightness (1.5 kW). Total weight 25 kg, with leather straps and copper pipe grip.
Can this be replicated without a CNC machine?▼
Absolutely. The build uses 3D printed templates for marking, a jigsaw, soldering iron, vise, and hand tools — all brass parts are cut and bent manually.
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