Run-Time Plot - Thor 10M Spotlight

[Roy]

This battery runtime plot is for a Thor 10M spotlight that uses a 7AH 12vDC Sealed Acid Battery.

Equipment used is a Extech Mdl 401021 Light Adapter into a RadioShack 22-805 mulitmeter with a PC interface that is using ScopeView software (V 1.08).

The vertical axis is 0.20mVDC per division. The cabilration factor of 1mVDC = 1Fc@1Ft is not used for this plot as the light was 27 feet away from the light sensor. The horizontal axis is 10 min per division.

Be aware that your actual battery milage may vary from that indicated by this runtime plot.

Runtime to 50% of max brightness = 44 minutes

 

[IlluminatingBikr]

Interesting run-time plot. Almost seems as if the light is semi-regulated or something.

 

[Kiessling]

yeah .. why's that?
bernhard

 

[3rd_shift]

Sealed lead acid batteries usually have a fairly flat discharge curve throughout thier discharge.

 

[The_LED_Museum]

When the 12v lead acid batteries in my chair get down to approximately 10.8 volts apiece, the chair just quits.

 

[NewBie]

There is nothing in it but a diode, LED and resistor.