Prototype off-road/boating spotlight - King COB!

A quickie test with the COB TIRs seems very promising. I need a proper heatsink and adapter plate however before I can do some beam shots. Almost impossible to hold everything together.

As far as the Vero29… it seems to play well with the TIR. I was afraid the mounting ring of the COB would interfere with the optics, but it just happens to fit almost perfectly. I think though for focusing purposes I’ll have to set the Vero29 just a tad down, meaning I’ll have to mill a circular pocket for it. The TIR housing I have even has silicone gaskets!

Even at “just” ~6500lm, the Angela-S is pretty awesome. I strongly suspect the Angelette-S is probably nearly ideal as it should have a slightly wider hot spot and a tiny bit more spill. This has me rethinking making a triple. A Vero29 capable of being driven at the full ~250w with one of these reflectors would be plenty.

So I can’t turn the pot too far before the board trips. I’m getting 34V at the LED. Even with the resistor mod. However I was able to run two Vero29s in parallel daisy chained using a 1MOhn resistor in series with the negative leg of the pot. Not much diming however. With the CXB3590 I’m able to dim to almost nothing; but I suspect the resistor mod may help me get that pot all the way with the CREE CoB. Still no way however to measure current.

Busted voltage regulator.

R7

Back with the MW driver and the new Angela-S

Control photo of the street. This looks a bit darker than it really is.

BOOM! :smiley:

@LouieAtlanza, could you please link the TIR?

I’m looking to make a similar build.

The contact name is Duncan Deng. You could mention I sent you over. Shipping by DHL is fast but a little pricey. How do you plan to driver your CoBs?

That reflector is a definite improvement over the other one. Nice!

Shame my driver sploded. I was really excited to see what it would look like @18,000 lm. Though, I really do think the other reflector would be better.
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Datasheets suggest that I’m right. FWHM should go from ~23 to ~29degrees and it should lose a little bit of throw. I need to get the other reflector so I can switch between them.

Did you just get a dud? Short somewhere? I’ve run everything from a 9V battery to a 6s2p LiPo configuration, and have not experienced that yet. I wish I burnt one instead of my CXB3590 that’s for sure!

You probably could just find that voltage regulator and piggy-back it… can’t cost a lot.

I’m going to replace the regulator. They’re only $0.40 from Arrow but I did also e-mail StratusLED to see if they would do anything.

It’s just annoying because I’m going out of town tomorrow so I won’t get to mess with it again until at least Saturday.

You have to bring FrankenCOB with you. Might find a good place to take pics in your travels!

The place I’m going doesn’t have much of a sense of humor so I have to be careful what I bring. Honestly, I probably won’t take my camera.

FYI, I don’t think the Angela, Angelette or Angelina reflectors are compatible with the Vero29se due to the height and clamp geometry. I’m glad I caught this as I was looking to buy some Vero29SE to play with. The non-SE Vero29 should work fine though.

Oh, and this Angela-s with the CXB-3590 throws a literal wall of light at least 150m. I don’t have the numbers to calculate ANSI FL-1 throw for this combo but it’s probably ~250m or so at ~36w.

I would check that, doesn’t the Ledil reflectors sit atop the Ideal clamp?

Finally got my 900W DC booster. I ran two 3s2p 5200mAh packs in series, and was able to take the Vero29 to 37.85V and 3.28A… for an estimated 17500lm at about 140lm/W. I ran the rig for about 10 minutes, and the voltage on the fresh set of batteries dropped to 3.95V. So I’m thinking at 17500lm I can potentially have about 40-50 minutes of run time?

So far I’m pretty happy with this boost driver, being CV and CC and fully adjustable. and programmable. I kind of like having the convenience of a pot to adjust output, but the down/up buttons work fine.

Next step - design a connecting plate to hold the CoB, lens, and housing on one side and heatsink/fan on the other, with a housing for the electronics and batteries.

I replaced the voltage regulator and the driver seems to work but it shuts off the output at 1.3A and just shy of 35v.

I haven’t received a response from StratusLEDs.

UPDATE: Have the adapter plate made, and BS’ed together with two threaded rod I had laying around. The CoB sits in a pocket. Gaskets were provided for the TIR and for the interface between housing and base. I will make a new base with a deeper pocket for the COB, so I can eliminate the gasket, and use thermal paste at the juncture to allow the housing to aid in cooling.

I got a bit brave, running without a fan, and got my test rig to 39.9V and 4.2A. So I was able to reach max current at slightly under the forward voltage on the chart in Bridgelux’s datasheets. Their charts also show that at 4.2A the lumens should be around 170% of test current, which is 2.1A. So theoretically I should have over 20000 lumens off the CoB. No way to test this but it’s so bright, I had to wear shades while adjusting current and voltage.

Here’s my test area. Unfortunately because of rain, I could not go outside to test this. I was under the canopy by the door.

And the area lit up. The beam is definitely directional, with a very gradual tapering of brightness going to the perimeter of the beam. Can’t see it here because I’m holding the hot light with one hand and my cellphone with the other.

And a pic of the beam spot from 1 foot away. The spot was so bright I couldn’t look at it directly. The picture does not convey that unfortunately.

Looks nice. :slight_smile: