Conditional Formatting, =weeknum = weeknum ... how to add a 3rd criterion ... check text?

I have worked out how to colour a cell based on a date ($E4) that falls within the week of another date ($I3). = WEEKNUM($E4,1) = WEEKNUM(I$3,1)

I would like to change the colour at this junction dependent on the selection at c4 but the rest of the criterion remains the same?

= WEEKNUM($E4,1) = WEEKNUM(I$3,1)

Thanks in advance.

Conditinal formating formula for cell I4:

=LOOKUP($E4,$I$3:$R$3,$J$3:$S$3)=I$3

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