The There Are No Stupid Questions Thread

[CNCman]

@JasonWW

You guys like that, huh?

Here’s a couple more pics showing more detail on the Cree Xtreme High Performance leds. This is a 50.2 below. The 70.2 is similar. Both are 2nd generation.

Ignore the tiny wires cut above and missing below. They don’t flow the main current. They are something to do with anti-static or something. I can’t remember off hand. The led still functions with the tiny wires cut. (The true positive and negative may need to be swapped around in the image above. I chose them arbitrarily for demonstration purposes since I could not see the mark on the backside.)

Now the 1st generation xhp50 and 70 had positive and negative lead wires coming out of each core. I added some black marks next to the leads since they are difficult to see. (Please excuse the low-quality image)

Here is a 5050 MCPCB that can be used in 6v or 12v.

In stock form it is not passing any current. If you want it to be 6v you would add some solder to the pads where the blue arrows are pointing.

If you want it to be 12v you would add a solder bridge across the yellow arrow pad.

All leds have some indicator on the top or bottom to show polarity to make sure you solder it correctly onto the MCPCB.

(The original pics are not mine, I found them online a long time ago. The MCPCB pic was outlined by the someone else, also.)

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JasonWW , You are a GEM here at BLF. You have helped me several times, THANK YOU :+1:
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[Oli]

@TermsakC

I am living in Singapore, which is reputed to be the “capital of ligthning” of the world.

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Yes and not everybody has the luxury of being able to stay indoors every time a lightning storm happens. But as pointed out above, unless you’re holding it above your head looking for lightning the body material is not really going to matter. The talk of use in the rain or submerged has to do with the ipx rating. Just about any light discussed here is pretty safe in the rain.

[TermsakC]

Thanks Oli and Lightbringer for your views. They are reassuring and useful to me.

[Lightbringer]

@JasonWW

@Lightbringer

Just avoid ones with magnets in them, like in the tailcap. That will suck lightning to you like fat kids to a candybar.

Magnets? He said he was serious.

And don’t call him Shirley…

[Lightbringer]

@TermsakC

That’s why I have asked for experts’ opinions.

Experts? Nah. Everyone just seems to yell at each other. Loudest person wins. :laughing:

[richbuff]

Question: what is the other flashlight forum going to be like now that it has been sold and the new owner is taking over?

[JasonWW]

@richbuff

Question: what is the other flashlight forum going to be like now that it has been sold and the new owner is taking over?

Any more details? I’m clueless.

[Pilotboy]

[Noob question warning] If a blue emitter makes everything look blue, does that mean it has a CRI of 1?

[pennzy]

@Lightbringer

@TermsakC

That’s why I have asked for experts’ opinions.

Experts? Nah. Everyone just seems to yell at each other. Loudest person wins. :laughing:

Last one to yell before the thread closes wins.

[mitsuki08]

Can I do a makeshift discharge test with a convoy S2+? Just curious if I can before I go for a hobby charger. I don’t need 100% accurate numbers just approximation to test some laptop pulls.

[Lightbringer]

Got an old one that’s 7135 based? Yeh. I’d only try it with a wimpier light, like 3×7135 for ~1A draw. Otherwise the light could overcook itself if left in free air and uncooled.

[mitsuki08]

@Lightbringer

Got an old one that’s 7135 based? Yeh. I’d only try it with a wimpier light, like 3×7135 for ~1A draw. Otherwise the light could overcook itself if left in free air and uncooled.

I have a 6x7135. Just plan on putting it on low(1%?) and letting it go do its thing

[dthrckt]

Has anyone posted a summary of emitter characteristics somewhere?

voltage, lumens per watt, max current, availability, cri, tint, etc? So many new emitters since the last time I was hanging around here, and I don’t have a feel for what to use for some mods I’m planning.

[mitsuki08]

@dthrckt

Has anyone posted a summary of emitter characteristics somewhere?

voltage, lumens per watt, max current, availability, cri, tint, etc? So many new emitters since the last time I was hanging around here, and I don’t have a feel for what to use for some mods I’m planning.

Maybe try here? LEDs & Other Stuff - (Reference Guide)

[Lightbringer]

@mitsuki08

I have a 6x7135. Just plan on putting it on low(1%?) and letting it go do its thing

Might, but ain’t sure how the battery would react. It’s not a constant current, but 1% pulses of high current.

[JasonWW]

@mitsuki08

Can I do a makeshift discharge test with a convoy S2+?

Not that I’m aware of.

[mitsuki08]

@Lightbringer

@mitsuki08

I have a 6x7135. Just plan on putting it on low(1%?) and letting it go do its thing

Might, but ain’t sure how the battery would react. It’s not a constant current, but 1% pulses of high current.

@JasonWW

@mitsuki08

Can I do a makeshift discharge test with a convoy S2+?

Not that I’m aware of.

Thanks for the responses. Guess I’ll go with a hobby charger to be on the safe side.

[Lightbringer]

Wellp, if you get a 1A light (~1.05A for 3×7135), it’ll be a constant current until it starts to pull out of regulation and dims.

[JasonWW]

@mitsuki08

Thanks for the responses. Guess I’ll go with a hobby charger to be on the safe side.

A $25 Liitokala Lii500 charger is well known for it ability to do capacity tests. It can discharge and recharge a cell and it’s results are good. That’s the cheapest I know of.

[mitsuki08]

@Lightbringer

Wellp, if you get a 1A light (~1.05A for 3×7135), it’ll be a constant current until it starts to pull out of regulation and dims.

I’ll have to check on that been a while since I took inventory. Thanks!

@JasonWW

@mitsuki08

Thanks for the responses. Guess I’ll go with a hobby charger to be on the safe side.

A $25 Liitokala Lii500 charger is well known for it ability to do capacity tests. It can discharge and recharge a cell and it’s results are good. That’s the cheapest I know of.

Yeah I was looking at that as well. Sad that the UC4 hasn’t come out yet. I was hoping not to buy more chargers except the UC4. Thanks for the recommendation!