LED Protoboards Twin Industries LED Protoboards provide a versatile solution for LED projects.The LED Protoboards have white soldermask to enhance LED luminosity, common bus power trace, locations for resistors to control individual LEDS, prototyping area for drivers, and locations for other components. Twin LED Protoboards feature FR4 0.062' thick laminate, prototyping holes spaced on a 0.1' x 0.1' grid, hole interior diameter = 0.037, and plated through holes with pads on both sides of the board.