Scope of delivery: A transformer is required for the recessed downlight, this is not included in delivery. if you need to buy, please search by ASIN, we provide matching 18W/36W LED transformer: B0BKW7N2TH/B0BKW79TXY. Dimming (or voltage change) by connecting a transformer with dimming capability. Easy to install: Cutout hole: 55-58mmOuter diameter: 63mmRecess depth: 20mm, 15cm connection cable. 15mm flat cabinet recessed spotlights, ultra-flat design, more suitable for small rooms. Ideal decoration: 3000K, 300LM, CRI>80, warm white light to create a comfortable atmosphere. The brushed nickel and frosted glass housing gives the lamp an aesthetic finish. Wide range of applications: Set of 3 LED recessed spotlights for furniture replace traditional G4 halogen lamps, suitable for cooker hood lamps kitchen, bathroom downlight, bedrooms, furniture cabinets, cabinets, showcases, mirror cabinets, shelves, etc. Energy saving and environmental protection: This LED has a long life. service life and will not be easily damaged. The built-in bulb cannot be replaced (the lampshade cannot be opened), and the built-in 3.5W LED module can replace the traditional 25W halogen lamp, saving light source and power consumption. energy.