An LED lighting apparatus including a plurality of lens members aligned substantially along a preferential/non-preferential line. Each lens member being elongate across the preferential/non-preferential line with all elongate lens members being in substantially same orientation and each configured for light to exit the unitary lens predominantly toward the preferential side. Each lens member includes an elongate opening for receiving light from a group of emitters aligned across the preferential/non-preferential line; a refracting inner surface forming a void and having a racetrack-shaped surrounding surface extending from the opening to a substantially planar elongate end surface; and a lateral surface having opposed preferential and non-preferential surface portions, the non-preferential portion being at an angle to the base plane which is greater than the angle of the preferential portion to the base plane.