How to limit longtable height?

I want to make a longtable, that would be 150 mm height, for a example, on the first page and full height on the following pages.

documentclass{article}
usepackage[left=2cm,right=1cm,top=2.5cm,bottom=1.5cm]{geometry}
usepackage{longtable}


ifnum value{page}=1
newgeometry{left=2cm,right=1cm,top=2.5cm,bottom=10.5cm}
else
restoregeometry
newgeometry{left=2cm,right=1cm,top=2.5cm,bottom=1.5cm}

fi

renewcommand{arraystretch}{4}

begin{document}



begin{longtable}{|l|l|l|} 
    
hline    
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 lorem & impsum & - hline
 
end{longtable}

end{document}