Upgraded my old Convoy S2+ with:
Luminus SST40 6500K(20mm MCPCB)
7135×8 + FET driver(from Intl-Outdoor)
Drop-in fit, used Arctic MX-4 thermal paste. Total cost: ~$22.
Results: Turbo: ~3000 lumens (flood-heavy, slight spill ring)
Med: ~900 lumens (regulated)
Gets hot fast—throttles after ~90s on turbo
Great budget flood light for night walks or bike use. Beam smooths out better with OP reflector .
How did you get the 3000lm figure? According to this test, the bare emitter never surpasses 2669lm; accounting for optical losses, no more than 2300lm can be expected.
The SST40 is now an obsolete emitter. For a floody beam, the LHP531 is cheaper, and has way higher output + efficiency, plus better tint. With the same driver, you can expect 3000+, possibly even 4000+, out-the-front lumens with the LHP531.
Something doesn’t add up, 90 seconds of 3000lm in an S2+ host seems to defy laws of physics, either you’re somehow running this light at sub-zero ambient temperatures (like, -20C), or the 3000lm is incorrect…
Kudos for resurrecrung ancient led technology, but the 3000 lumen spec is impossible. Even the highest binned sst40 can’t crack 2500 Lumens and that’s on very agressive cooling and on the cusp of burning out.
The S2+ with direct driver may get you 1500-1800 lumens, briefly.