Run-Time Plot - DownBoy400 and 700 Converters

[Roy]

Th e following runtime plots were done a part of test project on the DownBoy400 and Downboy700 converters using R2H LS's. Each LED was tested at 6v, 9v, and 12v using Sure Fire 123 Li batteries. The test bed for these runtime plots was a Pelican M6 2x123 flashlight. Sure Fire A19 battery extentions were used to get 9v and 12v.

DownBoy400
6v Runtime to 50% of max brightness =4 hr 33 min

9v Runtime to 50% of max brightness = 7 hr 52 min

12v Runtime to 50% of max brightness = 10 hr 58 min

DownBoy 700
6v Runtime to 50% max brightness = 2 hr 24 min

9v Runtime to 50% max brightness = 4 hr 27 min

12v Runtime to 50% max brightness = 5 hr 32 min

 

[highlandsun]

Interesting that the efficiency improves so noticably with the higher voltages. I.e., the runtime difference from 6V to 12V is greater than 2X in each case.

 

[McGizmo]

highlandsun,

I agree but am surprised at the lack of real gain on the DB700 from 9 to 12 volts?!? I wonder if there was a bunk cell or if the thermal issues of the light sitting there cut into the efficiency for some reason. Wayne Y. mentioned, as I recall, that on one test he did with a DB that a high current output coupled with a higher voltage in, caused the IC to get hot? Hummmm........... We need the experts take on this.

- Don

 

[dat2zip]

Thanks Roy for doing all the runtime plots.


I can't add much to this. The efficiency remains high up to 12+ Volts. As for thermal issues. I have only seen this on voltages past 14 Volts.