10w RGBW using 7.2v battery packs@900 mAh

[Kyp Durron]

Is it normal for a purple saber using a 10w RGBW and a 7.2 volt battery pack@ 900 mAh to only have a 36 minute idle run time? The LED is being fully driven (R&B for purple) and the saber is pretty loud and it's wired for FoC, but that shouldn't matter as it was being timed sitting idle...

[cardcollector]

Well, in order to do the math we will need you mah rating before we can figure out this is normal.

My first instinct is to say yes though.

[Kyp Durron]

The first post stated the mAh rating, it's 900 mAh.

[cardcollector]

Is that both or one?

And what is your LED being driven at? 700ma?

[Kyp Durron]

It's a RGBW led, the red and blue are on constant while the other two dies aren't doing anything while idle, I'm not sure what current the led is being sent to the led, I'm assuming 1500 mAh as I've seen LEDEngine LED's being run at that current...actually, now that I think about it, I believe I just answered my own question assuming that it is being driven at 1500 mAh.

GOD, I really need to wake up fully before turning on the computer in the morning....

[Sunrider]

sounds about right.

[Kyp Durron]

Actually, I found out it's running the LED at 1,000 mAh, not 1500...so it really doesn't make sense to me...

[cardcollector]

Ok so your led is running two dies at 1000ma each. So that 2000 ma total, you batteries combined, if both have a rating of 900mah each, have a total of 1800mah (millilamps per hour).

So we know now you led isn't going to last an hour...
Your timed runtime is pretty darn close to the specs...

So yes, your saber should last that long.

[JamoUp]

LedEngin RGBW are rated @700ma
R= 2.24-3.20v
G= 3.68-5.12v
B= 3.20-4.16v
W= 3.20-4.16

are you wired in series or parallel? is it the same for the FoC?

[xl97]

I would think about 40+ minutes or so is correct.. with FoC and 2 dies running together..

whats the problem? are you expecting more/longer?