Let’s compare LED and normal light bulbs useage like following. Let’s say you have living room with 6 light bulbs that you are using and everyday you use 7 hours.
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10.6Watt * 6LED light bulbs * 7hours * 25yen(per 1Kwh) = 11.13 yen per day
1 month = 334 yen
1 year = 4,006 yen
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60Watt * 6 light bulbs * 7 hours * 25yen ( per 1Kwh) = 63 yen per day
1 month = 1,890yen
1 year = 22,680yen
Ok, now the big question is when would be the breakeven point on this. Here is the answer.
ex, one LED light bulbs cost 2500yen. one normal light bulbs cost 300yen. This is still talking about useage of 6 lights for 7 hours per day. Normal light bulb’s life cycle is shorter than LED, so let’s pretend you replace to the new once before the breakeven because normal light bulbs last about 2000 hours.
( 6 * 2500yen ) + ( X # of days * 11.13yen ) = ( 12 * 300yen ) + ( X # of days * 63 yen )
X = 219 days
Maybe you dont use 7 hours per day, but it seems like you can break even within a year easily : )