Optical design of LED-based automotive headlamps

Design of an optical lens combined with a total internal reflection (TIR) freeform surface for a LED front fog lamp

“…LED has been widely used in automobile headlights, especially in the low beam and high beam headlamps [1][2][3][4][5][6][7][8][9][10], but few literatures have been reported about the high-power with small compact LED for front fog lamps. Reference [11] has disclosed a front fog lamp for a vehicle.…”

A composite light emitting device for sunset emulator with energy variation logic control algorithm

“…When the current flows through the PN (P-type and N-type semiconductors) interface, the LED emits different visible rays and invisible rays due to different compounds. Their shape and luminous directionality vary with the purpose considerably [5,6].…”

Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

“…Researchers are expanding LED's application in automobile front lighting systems [2][3][4][5][6][7][8][9][10][11][12]. The optical systems of traditional projective low-beam headlamps include an LED light source, an ellipsoidal reflector, a baffle, and a converging lens [3][4][5][6]. They usually use a baffle to form the cut-off line required by United Nations Economic Commission for Europe vehicle regulations (ECE) R112 [13].…”