> 2:I know irradiance 1.08279（W/(m2*nm).I have converted XYZ to the values
> of color rgb using formula,my conversion formula is:
> r=(3.2406*3.815429E-06)+(-1.5372*1.523114E-06)
> g=(-0.9689*3.815429E-06)+(1.8758*3.815429E-06)
> b=(0.0557*3.815429E-06)+(-0.2040*3.815429E-06)
> but the value of b is negative,it must be something wrong in it.

As I said in another post, if b is negative this indicates that the 
colour of your light source is outside the sRGB colour space. There is 
nothing physically wrong with that, sRGB only represents a portion of 
the colours we can see. Your light source is 817nm which is well into 
infra-red, a camera will see it but humans will struggle - that's why 
your calculated rgb values are so tiny and negative.

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