/diy/ - Do It Yourself

>>1701934
I like it.

>>1701936
They're really great. I've already converted all my outdoor halogen lights with this exact set up, 200w halogen to 50w led. Fantastic little things.

Damn it's like daytime in here. Also they're 30w chips not 50w, got mixed up with some others

>>1701934
>>1701990
Nice anon, you may want to think of a diffuser though, the point light might be rough on your eyes after a while of working

>>1702000
There is quite a bad glare off them but they're up high so it's not too annoying. Had thought of using a diffuser though. Any ideas for suitable material?

>>1702002
Basically anything that sorta works like a lampshade. I've used thin sheets of acrylic (like paper-thin) that I've sanded with high grit sandpaper. Some people also say to use vellum paper or even crumpled aluminum foil to reflect it.

>>1702007
Yeah that's a great idea! Am weary of using plastic but I can sand some glass

Wired straight into mains? What kind of circuit protection do you have?

>>1701934
how do you keep them from hitting 100C? is a sheet of aluminium like you're using enough?

>>1702041
They have internal drivers. Theyre basically unprotected, they're on a 6amp breaker but the four chips I have up only draw .5amps. Not too worried desu.

>>1702059
Hopefully. I Have a 50w chip on a piece of aluminium in a floodlight outside, been going for two years with no issues.

>>1701934
>Them rusty screws
>Loudspeaker cable for 230V

Unfortunately the thermal death will note come soon. The drivers have thermal protection, the current decreases when the temperature hits ~150°C.

>>1702017
You can use plastic easy, just make some standoffs so it's like 5 inches from the bulb, the further it is from the source and the bigger it is, the better diffusion you'll get anyway unless you're putting lenses in.

>>1701934
Any thoughts on how they'd do for growing plants?

Heat? Are you using fans to keep things cool? That aluminum will heat up enough to melt those wires in a day, two tops.

>>1702293
Ok 30w not fiddy watt. Still will be plenty warm

>>1702287
pretty well. 30W LED floodlights are bright as fuck, not sure how many lm they'd measure but a guy I know said they're enough to grow succulents most of his succulents

>>1701934
how hot do they get and how thick is the aluminum?

>>alumiuinium

>>1702215
>Loudspeaker cable for 230V
it's about watts you faggot

>>1702215
Only one screw is rusty and who gives a fuck

>>1702516
Correct. The cable can handle up to 2.5 amps and only have .5 running through them.

>>1702282
I might cut up some hdpe milk jugs. Don't know if I'll bother though. They're high enough where they're not always in my peripheral vision.

>>1702287
I have 3 x 50w cree leds for that. Getting on average 1.5g per watt.

Pic related. 2 red spectrum and one blue. These aren't the driverless chips but I don't see why you couldn't use them, some piece on yt have anyway.

>>1702506
I'd spelled it aluminium (Ireland) but I'd get shit for that too. Can't please everyone.

>>1702282
I'm thinking hdpe milk jug but don't known if I'll bother.

>>1702458
I've had these two 50w chips on this for about two years with no issues. The plate is only warm to the touch.
There's thermal paste on the back of all of these btw

>>1702556
What are the dimensions of this thing?

>>1702516
>being wrong about two things while only saying one thing
Congratulations, you are top retard.

Those specific cheapo lights are the worst of the lot, they have very low efficiency.
https://www.youtube.com/watch?v=2IViFd0-2p4
Also all these lights are very sensitive to EM, I burned out several with the HF start on my TIG.

>>1702684
17x5 inches

>>1702713
Yeah but they're cheap :^)

>>1702296
I just did the spit on my finger and touch them test. I didn't hiss so should be fine

OP building grow room for weed, confirmed.

>>1702287
crap. they're the usual high yellow/green output chips that mostly give off wavelengths plants can't use.

>>1701934
[flickering intensifies]

>>1702772
when you have more than 3 AC LEDs you don't notice it anymore

>>1702712
Elaborate

>>1702765
The other types are only like $1 more expensive, in the long run it's easily worth it.

>>1702811
It's not about watts, but amps. You could run 10000W through a thin string of wire if you had 100kV. Likewise for some car systems you might need super thick wires even though they're only a few hundred watts, because watts = volts * amps. A given wire can safely take a given amp load, regardless of volts, and thus regardless of watts.
Second, wires have insulation ratings. Some are made only for low-voltage, 50V, some are made for even less, so it does matter that you have the right type of wire for the right application.
Speaker wires are a tossup, some are rated for 200V+, some are rated 50V. OP probably won't die from electric shock, only from falling off the ladder when he has to replace them.

>>1702780
....
that's more flickering, not less. Are you sure you didn't just burn that part of your brain out on what you're growing?

>>1701934
How do those 50W LEDs compare to an incandescent bulb?

Now I’m thinking, I have some extra heat sink material laying around and there are a bunch of those driverless 50W chips on Prime for $7-$10ea. Would be down to make a couple lights for the garage when I want to light it up real good for working under the hood. But if 50W is blinding, there isn’t much of a selection of 10W-30W stuff.

>>1702847
Correct. I only used speaker cable because I had it on hand. They're well able to handle the amps, not too concerned about the insulation rating because I won't be anywhere near them.

>>1702865
Yeah do it man. I have some 10w chips but they're individual leds, rather than a cob. Have a look on ebay, that's where I got my 30w ones. Also you'll want to cover the bare contacts with something if you're going to be moving it around. On my work light, which I used for painting and move it around, it's mounted to a tripod and I put some hot glue on the solder joint, just in case I was to ever brush against it.

>>1702287
They'd work well. I have 3 cree cobs, two 2700k and one 6400k. Getting 1.5g per watt from 120w of light ;-)

>>1702287

>>1702865
the point is to get them from ebay or aliexpress for less than $2

>>1702853
>>1702772
That's not how eyes work, kiddo.

>>1702886
They flicker a lot on camera but it's not noticeable by eye. Though even incandescents flicker at 50/60hz

>>1702890
twice that actually, both top and bottom cycles of the wave form produce power.
/nitpick

>>1702847
You are correct that the wattage of the end device doesn't really matter (though in normal applications the wattage can often be used to guesstimate the current).
The heat output of the wire is what kills it and that can be measured in watts too, but maybe people don't look at it this way.

>>1702893
At the very least I haven't encountered it before, unless you're explicitly talking about a heater coil.

>>1702874
These cheapos are NOT like the Cree. The luminous efficacy is far below what a Cree COB is specced to deliver

>>1702853
Are you not referring the well-known issue of 50 Hz AC LED flicker?

>>1702886
>That's not how eyes work, kiddo.
Yeah it is. But some people really don't care.

>>1703021
No, the frequency is too high. On video camera you may notice it, but with your eyes you shouldn't. You can also adjust that frequency with caps and such.