Will turning off my moonlight nightlight during the day increase it's runnng costs?

Question

I recently purchased a moonlight nightlight, such as the one shown here:

http://www.carbonneutral.com/shop/details.asp?productid=938&productname=Moonlight%20-%20the%20energy%20efficient%20nightlight

all over the packaging and instructions it makes it clear that if you leave it switched on for 24 hours a day 365 days a year it will cost less than 50p per year to run. It states this so clearly so many times that I am concerned that by turning it off in the day time it will actually be costing me more to run somehow - is this possible? Could it use more power being turned on once a day than if it was left on all day? It doesn't flicker or get brighter if you leave it on, it appears to just come on, stay on, and light up the room (although it's not the colour like in the picture, it's definitely a bright green!)

Answer 1

No.

Answer 2

Laugh a lot, I can't remember the dog fights over London, but by 1945 I was 6 and can remember the V1s coming over, most of them drooped short in Croydon where I lived. Why am I lelling you this?

Answer 3

It is probally trickle charged using a powered up condenser.
Switching this off might mean taking the condenser charge cost again.
Switch off everything at the point of use except your light.
Count the revolutions if there are any, in your meter.
That is the cost of your light you are reading in terms of watts used over the time it takes to make one revolution.

Answer 4

I guess its got a photocell which turns it on when it gets dark, in which case you would save nothing by switching it off during the daytime as it would be off anyway. If it is lit all day then you would save about 25p per year by turning it off in daylight, I would be inclined to leave it on, as the makers suggest.