Lighting source and lighting apparatus

摘要

An LED module (100) includes: a first LED array (111A) which includes first LEDs (111) connected in series and through which a first branch current (I1) flows; a second LED array (121A) which includes second LEDs (121) connected in series and through which a second branch current (12) flows; and a transistor (122) which is connected to the second LED array (121A) in series, and adjusts a second branch current (12) according to a differential voltage between a first total forward voltage and a second total forward voltage. The first total forward voltage is a sum of forward voltages (Vt1) and includes the same number of the forward voltages (Vt1) as the number of the first LEDs (111). The second total forward voltage is a sum of forward voltages (Vt2) and includes the same number of the forward voltages (Vt2) as the number of the second LEDs (121).