Prototype off-road/boating spotlight - King COB!

Yes… That’s why i increased the depth of the pocket, so i can mount the housing directly to the adapter plate I made. Preliminary tests say it’s enough but that’s just by touch lolol. That said I’m not sure I believe IceLEDs claims of this suppirting up to 400W LEDs. Becausr if it can I might have to use it on my CPU lolol.

They’re probably assuming a steady state junction temp of 85C where the heatsink is up around 60C…
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One of my goals is to keep the COB…COLD.

Likely… but since I have it running at 168W, I think it should be fine. Having a 1/4” aluminum plate and the housing (which has to weigh about 3 pounds) should help a lot. Maybe once I get my rotary axis up and running I’ll make a new heatsink housing. But for now, this is fast and effective.

I do have another solution but saving that for my CFT-90 project…

Well, no new CAD models from LEDiL despite e-mailing them this morning. :frowning: I suppose I could just measure some key dimensions on the Leninas I have and make some progress with that…
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Allegedly, my L6 will be delivered tomorrow so I guess I might waste some time disassembling that and figuring out what sort of stupid I can do with it. :smiley:

Got the Vero29 to max at 70.5V @ 2.43A… If I’m reading the current vs. luminous flux charts right I should be right around 25K lumens… Will try to take some outdoor shots this weekend.

Did another test with just one 5200 mAh 3S LiPo. Still achieved 66.6V(!) @ 1A. According to Bridgelux’s charts that should produce around 10k lumens!

So now I know this works, I’ll get a cheapie 250W CV/CC boost converter to run it. This 900W one is a bit big. The IceLED heatsink just so happens to fit in 4” PVC pipe so making a housing should be pretty easy. It does end up weighing a bit more but I don’t think that’s too much a concern for its intended uses. Already have ideas for making vehicle mounting and powering, that would still be easily removed for handheld or tripod use.

As to dimming… I’ve mulled over this for a while. Really not much of anything I could find in the 60-72VDC range. Then after looking through my miscellaneous parts I find these DC motor speed controllers - basically a variable current drive. I hooked it up to the output of the boost converter, and voila! Dimming! Only thing is that this adds considerable bulk.

So I’m back to the TaskLED HyperBoost. Since they recommend a max 7A input current, I should be able to use 6 18650s easily, but I thought I read documentation that the max amount of cells in series that can be used is 5? I know VoB used 8 in the GT mod; I don’t know enough to know why that limitation exists…



NOTE: Motor speed controller NOT in these pics…

You’ll have no problem using up to a 10S lithium ion battery pack with the hyperboost.

Thanks for that… I’d like to use at least 8S 18650s… though the only ones I have now are some Sony VTC6s. Would those work?

Yes of course.

How will you be connecting them together though? Spotweld? Battery holder?

I’d like to use battery holders because I have them, and it would seem easier for me to pop them out and throw them in my charger. The holders I have are the ones that the cells snap in, with metal tabs not springs. My thoughts were to mount the holders 4 a side on a custom milled circuit board, then just have something like an XT60 connector at one end to plug into.

Would like to just buy a 10S LiPo but then I’d have to buy a charger as well as my charger will only do 2S or 3S.

Technically, these are leaf springs, but I know what you mean.

Yes thanks… Being I’m not trying to yank 15-30A out of these batteries they should be fine… no?

Yeah, as long as you don’t exceed like 5A continuously from the cells.

Then I suppose I’ll need 10S then, otherwise if I ran 8S I just might exceed 5A…

Well, you could just run a 20AWG wire across the contacts, that will give you enough current capability no problem.

Sounds cool… Thanks again for the input!

Dudeguy confirmed for me a while back that the hyperboost could handle 12s.

I have two HyperBoosts. As of yet untested. But I like that a 50k pot can be wired directly to it for dimming - which is an important feature for me. I don’t need full tilt all the time, but it’s good to have.

With my test rig, I found that the Vero29 will produce light even at around .06A. Pretty cool.

I think if I can get my hands on an extension tube for my Convoy L6, I’m going to put a Vero29 in it. I’ll have to cut down a Lenina to fit in the head but it would be brighter than any other L6, probably cheaper than my 21x LH351D concept and more unique.