LEDengin 5w and 10W info and wiring guide....for noobs

[StickStickly]

lol got it. So last question.. I swear ! With this particular set up.. what batt solution would you recomend ?? I was thinking a dual 18650 7.4v "stick" configuration. Will that be enough juice ? Or should I go for an 11.1v or more set up ?

Thanks Fender !

[FenderBender]

An 18650 stick will 'work', but an 11.1v pack would be more appropriate. If you want runtime but can't squeeze 3 18650's in there (damn, that would be a lot), try 3 14650's, in a triangle shaped pack. They'll fit, give you decent runtime, and run the LEDs at max.

[StickStickly]

Sounds amazing ! Your the biggest help Fender ! Thanks so much.

[amwolf]

Could someone tell me if my thought process/math is correct? I’m looking at using a 7.4 volt battery back (2 14500’s 800mah) to drive a 10w RGBW (from the store) through a PC v2 with a PXT for FOC. The B and G will be wired together off the PC’s main LED pads in either series or parallel to achieve the “sky blue” color; I'm not trying to resistor to cyan.

The white pad will be used for the FOC off the PXT. According to the spec sheet, the forward voltage for that pad @ 1000 mA is 3.5v, so R=(7.4-3.5)/1=3.9 ohm resistor, 3.9 watts? (the online calculator says a 4.7 ohm 4.7 watt resistor?). HOWEVER according to the PC2 manual, the 3.9 watts could be rounded down to 3 watts. ALSO HOWEVER “clash-flashed leds the wattage can be 1/4 of the recommended” so, uh, 3.9 ohm 1 watt? Which the Store doesn’t sell, so we’re back to 3.9 ohm 5 watt?

I feel really stupid right now. And I’ll be seeing “red sauce on pasta” flashing in my dreams. Thanks for the help.

[TuxedoCartman]

I think your math is right, amwolf; a 3.9 ohm 1 watt resistor should be perfect. You just might have to take a trip to Radio Shack or somewhere to get the resistor you need.

[Silver Serpent]

The wattage you calculate is a minimum required. You can always go larger and it won't affect anything other than the space taken up.

The online calculator tends to be a bit on the conservative side. 3.9 ohm 5 watt is an acceptable resistor for FoC. If you had a 3.9 ohm 2 watt, it would work as well for FoC.

I don't think I could drive to Radio Shack and pick up a single resistor for $0.66. If you're already placing an order, I'd go ahead and get the one here.

[amwolf]

Thanks for the help!

[FenderBender]

It is a fraking honking resistor though. I would wire the white in series with the R and use a 2W 1Ohm resistor. Less room taken up, brighter FoC. Win.

Red Sauce on Pasta is a way of life.....remember that.

[amwolf]

And thank you too, FenderBender! I've got a set of house plans on my desk with calculations and notes in the Foyer, so I could try and make sure I could figure out how you got that 2W 1 ohm... and I did. I feel slightly less stupid now.

[Kevin Starwaster]

It is a fraking honking resistor though. I would wire the white in series with the R and use a 2W 1Ohm resistor. Less room taken up, brighter FoC. Win.

Red Sauce on Pasta is a way of life.....remember that.

Yeah, you know, I'll never be able to see the 300 the same way ever again and it's your fault. You know this, right?