Iiphaneli zelanga eziphezu kophahla zinokubonelela ngamandla acocekileyo, ahlaziyekayo kwindlu okanye kwisakhiwo, ukunciphisa ukuthembela kwimithombo yamandla emveli, ukuthoba iindleko zamandla, kwaye kubangele ungcoliseko oluncinci kwindalo esingqongileyo.Nangona kunjalo, xa ukhetha kwaye ufaka iipaneli zelanga eziphahleni, izinto ezifana nesakhiwo sophahla, ukuqhelaniswa, kunye ne-shading kufuneka ziqwalaselwe ukuqinisekisa ukusebenza kakuhle kwenkqubo kunye nokhuseleko.