voltage which lights dimm

[Mobilesport]

Approximatly what voltage/specific gravity does the lights start to noticeably dim?

 

[highdesertranger]

what lights? highdesertranger

 

[Mobilesport]

what lights?  highdesertranger

Interior dome lights

 

[SternWake]

12v INcandescents bulbs tend to get dim at less than 11 volts.

But 'dim' is subjective to the eyes viewing them

Put voltmeter on engine battery. Put hydrometer in engine battery, put voltmeter one one bulb socket with other dome light bulb illuminated. Compare that voltage to battery voltage. ~0.6v difference? Double it to 1.2v to represent the voltage drop when two bulbs are on the circuit.

Look into LED bulbs for interior dome lights to save engine battery from 'open door' loads. What type of bulb does the dome light use? They make LED replacement bulbs for every interior halogen fixture and they will consume 1/7th to 1/10th the electricity and be brighter and 'whiter'

 

[highdesertranger]

well technically the incandescent bulb starts to get dim as soon as voltage gets lower than it's rating. incandescent bulbs have a rating say 14 volts as soon as voltage drops below 14 the bulb gets dimmer. you will not notice with your eye until the voltage drops .5 volt or more. the further you get below 14 the dimmer the bulb will be. this works the other way too the more above the rating the bright the bulb, this will shorten the life of the bulb until you get to high and the bulb burns out. highdesertranger

 

[MrNoodly]

By the time you notice the light dimming, it's too late.

 

[Mobilesport]

By the time you notice the light dimming, it's too late.
Yea, my specific gravity test indicated that my batteries are 25% full , my 3 amp led lights still work fine and i was'nt supposed to go below 50%

 

[highdesertranger]

Mr. Noodly is right, usually by the time you notice it's to late. highdesertranger

 

[blars]

Incandescent bulb brightness is roughly related to the square of the voltage. Life is related to the inverse square. Long life bulbs were run cooler, efficient bulbs were run hotter.

White LEDs are about 3.2v, but are actually specified by current rather than voltage. 12v LED lights are usually sets of 3 with a series resistor (to waist the extra voltage) or a constant-current DCDC converter. The former will vary in brightness with voltage, the latter won't within the designed voltage range.