Prototype off-road/boating spotlight - King COB!

Have you tried running the StratusLED driver off 6s?

We went for another walk tonight with the ghetto rig and had clear skies and nearly a new moon. This thing definitely needs a tighter reflector to limit the spill on the ground close to you. I’m probably going to switch to a Vero29 and an Angelette-S as I think I can just barely fit it inside the battle lantern. It is deeper and wider than the Angelina series so hopefully it will work better. I really wish they had something in the Angelette series inbetween the S (10deg) and the M (50deg).

I asked LEDiL about using the CXB3590 with the Angelette series because it isn’t listed in the datasheet but I can’t see a reason why it wouldn’t work.

That’s Kunrui, right? Does it work well?

Yes… Link on page 3.

Don’t know yet! Waiting for the Bridgelux LEDs to … Don’t feel like taking apart the CREE rig as removing the reflector is a great pain.

Do you have any ideas for large diameter tubing to use for something like a triple? I may need something ~7” ID. Long ago, I made a mini wind tunnel to take to trade shows using a large PVC pipe coupling…

You can get PVC pipe coupling up to 14” diameter. They get MEGA expensive after about 8-10” or so. A way cheaper solution is to buy drum shells - 5, 7, 10 or more plies so they’re very stiff… You can buy them wrapped with metal or wood veneer. You an even get clear or opaque acrylic.

… like… musical drums? I didn’t know that was a thing you could buy.

There are quite a few folks out there that make bespoke drums, and very, very few of them laminate or bend their own shells! Or have the convenience of 5-axis CNC to do secondary operations like milling the edges or drilling and pocketing. Many manufacturers also outsource the shells. And different numbers of plies can affect the sound of the drums as well, so they are tuned to a player’s preferences.

So, a 3-up COB cannon… nice! I think you may have to start building a trailer to haul that thing…

Looking at 36v Vero29se, LEDiL Lenina-S reflectors, StratusLED drivers, 6s lipo, server/workstation heatsinks and a single fan.

What would be nice for the Stratus LED drivers is to find a 10kOhm slider pot that is panel-mountable. I’ve found a few but they’re board (pin) mount and I don’t feel like jury-rigging one, though I suppose I could make two L-brackets out of scrap copper sheet and solder them on to the ends. But yes, I think a combination of Vero29SE 36V and Stratus LED driver is about the simplest solution around. I really need to procure a clamp meter to check the current going to the LED.

I do like the Lenina-S and the efficiency with the VeroSE is really good; thing is I’d need to figure out a clear lens solution; which would mean building a housing, These housings I bought with the TIRs - still can’t believe I got them for $5 each. There has to be about $5 of aluminum - and that’s before it’s extruded, cut, ground, machined, and anodized. Just amazing. It’s like buying a $20 housing and getting a glass TIR for free.

Yeah. ~50k lumens from something ~7” in diameter ought to be fun. I’ll probably use the 6s16k lipo packs I have so the c/g is pretty far to the rear so you’re less likely to accidentally flash yourself. The hilarious thing will be that it can do 36k lm without really even trying.

LEDiL makes a lens that fits into the Lenina reflectors.

I ordered one of the StratusLED drivers to play with and also to see where its limits are.

One thing I may do is basically put a momentary switch in parallel with the pot so you have instant access to “turbo”. I was also thinking about doing something similar to allow for temperature regulation/protection.

There a re a lot of possibilities… I’d like build an array myself and control it remotely and program different configs with raspberry pi… But I have to get them running first LOLOL

So in regards to the Meanwell LDH-45-1050 boost drives, I cross-referenced COBs at DigiKey that operate between 35-42V and max 1.05A, and got some interesting result… CREE CXB1820, which tests at 2690lm @ 550mA, and up to 160-180% rated output at max current. And just over $10 each!

Some more at Mouser… a Lumileds L2C5 that does 4900lm @ 900mA, and CREE CXB2540 rated at 4860lm @ 1.1A.

The only downside to the smaller LES COBs is they’re not as efficient but you may not care about that if you have other driving factors.

Yes - for one they’re smaller… which means better selection of optics including lenses. Second, they could be better with reflectors for more down-range illumination.

The ones I listed above are still about 130lm/W even with the LDH-45 driven to max…

Yeah, I spent a lot of time studying the Vero18 and I seriously considered using it but I like the efficiency of the bigger Vero29.

BTW, I got the StratusLED driver and Angela-S in the mail this morning.

Did you install the resistor on the adjustment pot?

Speaking of which… I just received the Vero29s…. pretty excited to test these out. Need to see what gage wore they recommend for the push-in connectors…

Resistor on pot?

BTW, I found documents suggesting that this driver should be able to handle 200w. I’m trying to get the actual datasheet for the driver chip so I can reverse engineer it a bit.

GUH no wonder why… :person_facepalming: :person_facepalming:

Well, like I mentioned I get a max reading of 42V so that would mean tis thing is capable of over 240W? For $15 that’s not a bad deal…

Well, the IC can be “programmed” to limit input current, output current, voltage……

So I suspect it can’t do 200W stock. It may need some components changed to do 200w. But the main IC can do 200w.