NBv3 and tri-rebel bbw

[Neilhl]

Hi all,

I'm going to be wiring the above but I have a quick question.

The white will be wired to the foc with a 1.2 ohm 1w resistor, the 2 blue will be for the main blade. If I use a resistor on each blue they will also be 1.2 ohm 1w but the nb manual shows using a single resistor for the 2 led's. If I wanted to do this how do I work out what resistor is required to handle both led's

Thanks all

[darth_chasm]

Welcome to the forums.

You can find the specs for the rebels here http://www.thecustomsabershop.com/Lu...Star-P523.aspx

And you can check the links in my sig for figuring out your resistor needs. We tend to recommend one resistor for EACH led.

[Neilhl]

Thanks, I've worked out the resistors for each individual light just couldn't find a guide to work out what resistor was needed if running 2 lights off a single resistor as per the nb manual

[darth_chasm]

The resistors for your blues are 4x what you need (0.3 ohms). You'll get a little brighter output with a .47 ohm resistor. Your choice of course.

[Neilhl]

Ah I see what you mean, the forward voltage on the link you posted to tcss is different to that on luxeons site (2.95v @ 700ma) so that's why resistor calculator suggested 1.2 ohms

[darth_chasm]

Hmm, if I have the same page you do, I'm reading in the footnotes (4) that the 2.95v is at 350mA. http://www.luxeonstar.com/lxml-pb01-...ebel-led-470nm

Thats about a third of what leds in sabers are typically driven. We tend to drive leds at their max current (1000mA). 700mA for reds, ambers etc.

[Neilhl]

Thank you so much for your help. So if I go with the forward voltage from link you posted at 1000ma for my calcs I should be good? And run both blues off their own resistor not one

[darth_chasm]

No problem. Yes you should be good. Just double check if you decide to buy the led from somewhere other than TCSS. And yes, a resistor on each led is commonly recommended.