High-power 8 g4 side pin LED color: Warm white product description The g4 side pin uses 8 high-power LEDs to provide enough light for reading and use. Like all our replacement bulbs, the g4 includes a built-in step-down regulator, making it the strongest regulator on the market today, and it generates almost no heat. The outer diameter is 23mm. 9 inches, 2-pin, wide, 120 viewing angle, 123 lumens, 40,000 hours, and life span, 8v-30vdc 1.2w.