An optical projection module includes a front optical module, a rear optical module and an adjustment member mounted between the front and rear optical modules. The filler includes thermal black in a content of 1 to 10 parts by mass based on 100 parts by mass of the fluorine-containing elastomer, and plate alumina in a content of 2 to 10 parts by mass based on 100 parts by mass of the fluorine-containing elastomer. Lighting elements may be translated along a length of a rod, particularly where it is desirable to illuminate only a portion of a rod and conserve valuable energy.