Circuitry in Arc LSL-P?

[donn_]

Can any of you old-timers tell me what circuitry is in the Arc LSL-P? I just picked one up which has the original driver, and a neutral XP-G emitter, and I'm trying to nail down two things.

1. What is the drive current? The previous owner thinks .5A. I'd like to know for sure.

2. Can a 3.3V or 3.7V cell be run in this light? I tried a 3.3V briefly, and noticed no tint-shift or any other unusual effects, but I want to be sure.

Thanks in advance.

 

[SilverFox]

Hello Donn,

The current sounds about right, but I don't recall the actual figure.

Use of Li-Ion cells was not recommended, but several of us did it without problems. That is no guarantee that you won't have problems, but if you are willing to take a risk it will probably work fine.

Tom

 

[louie]

IIRC, drive current is 350mA. According to the original instructions,

The circuit will operate in a voltage range of about 1.4 to 3.4 volts. We do not recommend you use batteries over about 3.2 volts as this could possibly damage the LED and circuit.

I think it goes into direct drive over 3.4v.

 

[Bullzeyebill]

It runs a constant current boost driver, at about 500mA's to the LED. Not a good idea to run an RCR123, 3.6-4.2v. If current was closer to 1A to the LED then it might be ok, in that the voltage would sag under load. The earlier First Runs used a voltage boost driver, and RCR123 would be ok, if heat sinking was right on.

Bill

 

[louie]

I doubt the 500mA in stock configuration - those Luxeon 1s were all rated at 350mA max in the spec sheets, and I believe both Arc and Surefire followed that in those Lux 1 designs. My notes say that the original current sense resistor on a LSL or LSH is 0.15 ohm for 333mA, and adding another 0.15 ohm to the parallel empty pad would double the current to 666mA.

Wayne at the Shoppe designed it; maybe ask him?