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Light Guide Forming Instructions Lumination Contour Tetra ® LED Lighting System (GEXNLG15, GERDXNLG15, GEPOXNLG15, GEYAXNLG15, GELGXNLG15, GEGLXNLG15, GEBLXNLG15) Step 1: Preparation Remove the protective film from the light guide. Mark the light guide at the required length, adding 0.5 in. (13mm) for every 16 in. (406mm) to account for shrinkage during the forming process.