Bivar VLP Series LED Light Pipes. The VLP series from Bivar are a family of vertical board mount LED light pipes. These round light pipes are available in a range of different lengths with either a flat or domed top. VLP light pipes are designed for use with surface mount (SMD) LEDs.. Features of the VLP light pipes: Rigid board mount light pipes for surface mount LEDs 3mm diameter face 4.7mm square footprint Clear Polycarbonate material