LPF Site Supporter
- Sep 4, 2020
Man wish I had money -_-
Hi Alaskan,I ordered ten for a project, need eight, two are spares. The package looks full, but it is only the bottom row. You can however reach out to the ebay seller and buy a single unit from them, I will PM you.
I just finished powering up this diode, the power is awesome, I will measure the power later when I get home, put this together during lunch at work, already had everything ready to pop the module in. Power out of a Techhood G8 lens (disappointed, is not 8 mm FL, closer to 5) is 1.6 watts when set to 2388 mA, so the 1.5 watt spec at 2.3 amps is probably what it does at that current. I didn't run the current through ranges yet, just set it there doing a power-on to measure current and then power off to do the adjustment each time, no way to know where it really ends up with much accuracy each time that way, but small movements so I didn't go too far. Will do so later.
Edit: Updates below.
Having arrived home and made a power measurement and trying to adjust the output higher, it appears 1.6 watts is about what to expect for max collimated output. So unless I am having a driver issue, I can't get much more out of this first diode. For a diode designed for 1.35 watts at 1.9 amps, 1.6 watts isn't too bad. My plan was to only use them up to 1.5 watts output at the max rated current of 2.3 amps.
Below, photo after power being readjusted, didn't adjust high enough to hit 1.6, but close enough. Only surprise is the divergence is shyt, about 9.13 mRad in one, 4.35 mRad in the other polarity, far worse than a NDG7475. While I am sure the FAC lens added helps a lot, that still isn't a square beam, not at 15 feet and certainly not at 100 feet. Uncollimated the beam appears square, but for some reason not when collimated, in addition to the FAC it needs 2 x expansion and a 5x beam expander minimum, IMHO. I tried it with a 10X expander tonight and then the beam then looks great, even without a 2x cylinder pair it is a nice narrow far reaching beam.
Although the beam characteristics are disappointing, even with a FAC installed, the power is not. For my application the wider divergence of both polarities won't matter, I intend on using a beam expander on it, had from the start before I found this. Wish for higher power green diodes? You can, for a price; higher divergence.
My thought is with this kind of power from one diode, wouldn't it be cool to make a pointer using two of these diodes through a PBS cube, cylinder pairs to correct the beam shape more and a 10X expander, then you would have something awesome.
Brass and copper 2x 26650 battery host by LPF member Rich Lifetime17
Re: Above photo, see that slightly larger appearing squared off tip at the end? That is because the divergence is too high (for what I like, being this is a toy without an application beyond fun, there is really no such thing as too high). Because of how far away it is, for what I want to see the beam should look more narrow at the tip, not flat, but is expanding far too fast to give that appearance. The tip is a big 2 x 1 rectangle at the end and at that distance is huge up there..
Sounds like feedback loop interference between the 2 effectively cutting their current limit in half. Adding an Isolated DC-DC converter in series with either of em should solve the issue.8.2 VDC, the diodes only need 4-5 VDC, the supply is capable of 30 amps, drawing less than 5 amps total. Very short 16 gauge wires, just a few inches to the power supply. It is behaving weird, if I hook up each diode alone, not powering the other, then full output, hook the power to the drivers up together and reduced power. It is acting like there is a current or voltage drop problem, but that isn't occurring.