[Design with Terry]Wurkkos TS32 15000+ Lumens Flashlight Concept

[JaredM]

Yinding "5050 30W" round die domeless led tested

[image] I can’t find it back on BLF but someone (JaredM?) recently pointed to this Yinding 5050 led on aliexpress as a potential high performance throw led. It has a die size that is slightly larger than an Osram PM1 die and claims to run at 8A which is definity high performance throw area. And the die is round! , which promises beautiful hotspots, from both reflectors and aspheric projection lenses. Chinese leds are improving fast, so let’s see how this one compares to the establ…

I recommend reading through the whole thread.

Yinding "5050 30W" round die domeless led tested

[image] The seller shared this spectrum information with me. 7135K and –0.0044 Duv. ~71 CRI. Test looks to have been a 15ms pulse at 8A. Lumens clock in at 1578 in their sphere. For some reason their power calculation is way of, voltages are weird. But if I go off my numbers, 8A was just a smidge under 4V, so that’s roughly 50lm/W. Here is my output test of the de-lensed emitter vs the PM1 Osrams. My area measurements differ from djozz’s. CSL NM1 – 1.04mm² CSL PM1 – 1.97mm² YD5050 – 2.22mm² …

Here I compared the YD5050 to the 2mm² class Osram emitters. It puts out a few more lumens and similar throw to Osram HX. The Vf is higher so it works better with FET drivers. The round die makes it unique and generates a super clean hotspot and round corona (no flower petals).

What is the diameter of center reflector? I’m guessing ~30mm. If this is correct, I would expect ~135kcd, so what is that… 735 meters?