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How long can an electric lamp of 100W be...

How long can an electric lamp of 100W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as
`""_(1)^(2)H + ""_(1)^(2)H to ""_(2)^(3)He + n + 3.27 MeV`.

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About `4.9 xx 10^4 y`
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NCERT BANGLISH-NUCLEI-EXERCISE
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  17. How long can an electric lamp of 100W be kept glowing by fusion of 2.0...

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