Ya, it will not save you much but before that you have to decide if it will be useful to you practically. If it is ok , then go for it. It will be small for you but if you spread the word,( others will follow) It will be very good for our mother earth.
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You won't. You won't like the blue light and you will end up using regular lights anyway.
Work out the total wattage - 1000 watts for an hour is a unit of electricity look at your bill to see how much 1 unit costs and the compare the LED wattage with the standard bulb wattage.In general the answer is a LOT but it isn't going to make you rich.