djpark
Enlightened
Can\'t understand the battery current reading LSH-P
I can't keep myself from the excitement of having a new LSH-P and I believe all senior CPFers will understand why I keep measuring the voltage and current and so on... /ubbthreads/images/graemlins/grin.gif
I have trouble understanding this current meter reading of my LSH-P and hope someone can enlighten me. /ubbthreads/images/graemlins/help.gif (I admit my DMM is a cheapo and the result may be quite erratic.)
The 123 battery which came with the LSH had 2.93V (a little used during QC test?) and draws 1.05A current.
A new replacement battery had 3.27V and reduced to 2.93V soon, it draws 1.02A.
Freshily charged GP NiMh 1300maH had 2.60V and draws 0.8A.
The brightness of all 3 battery sets look alike (I don't have a meter) but the total wattage consumed is about 3W for CR123 batteries while 2W for NiMh.
Assuming 80% of efficiency for the regulator, it is still 2.4W and 1.6W respectively.
I understand the standard current driving of LS1W is 350mA at Vf=3.5V, it comes to about 1.2W.
1) Why is the wattage from CR123 and NiMh are so different if the current to LED is regulated to be the same? (Or am I missing a point somewhere else in other CPF threads?)
2) Does LSH overdrive the LS1W? (My LSH-P is really nice bright.)
Whatever outcome, I know the functionality of the light is never affected, but just can't keep the curious mind bugging. /ubbthreads/images/graemlins/wink.gif
DJP
I can't keep myself from the excitement of having a new LSH-P and I believe all senior CPFers will understand why I keep measuring the voltage and current and so on... /ubbthreads/images/graemlins/grin.gif
I have trouble understanding this current meter reading of my LSH-P and hope someone can enlighten me. /ubbthreads/images/graemlins/help.gif (I admit my DMM is a cheapo and the result may be quite erratic.)
The 123 battery which came with the LSH had 2.93V (a little used during QC test?) and draws 1.05A current.
A new replacement battery had 3.27V and reduced to 2.93V soon, it draws 1.02A.
Freshily charged GP NiMh 1300maH had 2.60V and draws 0.8A.
The brightness of all 3 battery sets look alike (I don't have a meter) but the total wattage consumed is about 3W for CR123 batteries while 2W for NiMh.
Assuming 80% of efficiency for the regulator, it is still 2.4W and 1.6W respectively.
I understand the standard current driving of LS1W is 350mA at Vf=3.5V, it comes to about 1.2W.
1) Why is the wattage from CR123 and NiMh are so different if the current to LED is regulated to be the same? (Or am I missing a point somewhere else in other CPF threads?)
2) Does LSH overdrive the LS1W? (My LSH-P is really nice bright.)
Whatever outcome, I know the functionality of the light is never affected, but just can't keep the curious mind bugging. /ubbthreads/images/graemlins/wink.gif
DJP