his bulb replaces G4 bulbs, and other LED disk modules with side pins. 10-16VDC input range - constant power. 90 max lumens. Similar brightness to a 4 or 5 watt halogen G4 JC5. Commonly used in dome lights and reading lights. Low eye strain bright warm white. Dimmable from 7.5-10V. 1 1/8" diameter. Extremely long life. Smart driver included in this light is not +/- polarity sensitive.