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Strength of Non-Compact HSS

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Title: Strength of Non-Compact HSS

What is the formula for reducing the strength of non-compact HSS?

LRFD, pg4-8 gives the formula
 phi.b Mn = phi.b Mp - phi.b(Mp-Mr)[(Lb-Lp)/(Lr-Lp)].
But the section says that this is for I or C rolled shapes only.

LRFD, App. F, pg 6-11 gives (substituting l for lambda)
Mn = Cb[Mp - (Mp-Mr)[(l-lp)/(lr-lp)]

Can I use the second formula for any shape?

Mark Jones
Jacobs Engineering