Jack Mac wrote:

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03_troopy wrote:

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jules47 wrote:

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You can, of course, buy a light that uses only 1 amp per hour - so hardly any draw on your battery at all. Have had one for a long time - can get 12 volt or 240 v - think the brand is Navara or something like that - used it in camper trailer as well as caravan - really bright, good to read with etc. Also have one of the solar shed lights from Bunnings - puts out an amazing amount of light.

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 Hi Jules, that light if it draws 1A for an hour would also draw 1A for 1 second. What sort of light are you talking about? is it a LED light or some form of incandescent light and most importantly, how much light does it produce. The point is a 12Volt 12Watt incandescent globe would would also draw 1Amp ( for however long it was connected to the battery or the battery  died) but it doesn't put out much light. The brand is probably Narva from the sound of it too.

Cheers Bob

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 Forgve my ignorance, but I don't understand how a light that draws 1 amp out of a battery for one hour's use would draw 1 amp out of the battery for 1 second's use.

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 If the lamp draws 1 amp, it draws 1 amp for however long it is connected. An amp is a measure of current that a load draws, not the power it dissipates over a length of time.. It's like the speed that water flows through a pipe, not the total amount of water that flowed through the pipe length over that time. The total amount of water would be similar to the power dissipation in watts. Not sure that analogy is totally correct, but basically if the light draws 1A at 12VDC, it will keep drawing 1A no matter how long it is connected.