[Wblack]

So i measured a extincion of higher than 1.000 should i continue using lambert-beer law which is capped till 1 or should i solve with the y=ax+b equation which i made from some standards ?

[sjb]

If your ε is too high to measure, how do you know its value?

[chenbeier]

So i measured a extincion of higher than 1.000 should i continue using lambert-beer law which is capped till 1 or should i solve with the y=ax+b equation which i made from some standards ?

Dilute your sample if it doesn't fit in your standard curve.

[Babcock_Hall]

Your question implies that an absorbance that is greater than one cannot be measured.  This might be too simplistic an assumption.  The problem of stray light becomes gradually worse at higher and higher absorbances, but there is not a sharp cutoff.