Amp draw numbers for 2-cell lithium powered lights

Here's some revised amperage readings from most of the 2 Cr-123 powered lights. I didn't get voltage readings due to a meter problem (dead batteries):

1. Streamlight TL-2: 1.22A (same bulb that's used in the Scorpion)
2. Streamlight TT-2: .64A
3. Xenergy 2 cell: .94A
4. Legend LX: 1.20A
5. ASP Triad: 1.18A
6. TACM: 1.12A
7. Pel. M6: 1.22A

SUREFIRE:
--E2: 1.05A
--E-series LOLA: .50A
--P60: 1.11A
--P61: 2.27A
--A2: 1.50A

--dan

Re: Amp draw numbers for 2-cell lithium powered li

Good data, thanks. Any idea why the A2 uses so much more current than the E2, P60, etc.? It's not brighter.

Re: Amp draw numbers for 2-cell lithium powered li

Since the A2 is regulated, I'd say that is why - the regulator circuit itself uses up a small amount of power, depending on its efficiency.

Graham

Re: Amp draw numbers for 2-cell lithium powered li

The regulator in an A2 should be extremely efficient, like 95% or better. So something is wrong.

Re: Amp draw numbers for 2-cell lithium powered li

Is it as high as 95%? I haven't seen any data on this, so have to admit ignorance.

Is there any info documenting the efficiency?

The other thing is that it will depend on the battery state - the regulator will draw more current from the batteries as they get used, in order to maintain the same output level. But I would assume Dan used fresh batteries..

Graham

Re: Amp draw numbers for 2-cell lithium powered li

I used two sets of cells: one pair of Surefire's and one pair of Toshibas. I swapped between the pair to limit heat-up, etc. Both sets were brand new. Each bulb was ran only long enough to get a stable reading on my voltmeter.

--dan

Re: Amp draw numbers for 2-cell lithium powered li

[ QUOTE ]
paulr said:
Good data, thanks. Any idea why the A2 uses so much more current than the E2, P60, etc.? It's not brighter.

[/ QUOTE ]

While this may indeed be true, you'd never be able to detect it by eye. Even in a straight up side by side A/B test it would be very hard if not impossible to detect such a small relative change. It would need to be carefully measured, and probably several individual lights of each type measured (to eliminate indivudual variances) I should think.

And I'm not at all sure about 95% efficiency. If so, they should quit the flashilght business and go into the power supply business full time.....

Or so I see it.

Doug Owen