546 LED 12 Volt Color Changing Replacement Swimming Pool Light Bulb Brand New Direct Replacement Screw Fitting Underwater Pool Light Bulb, 12 Volt and 28W-33W. 546 Color Changing LEDs: Neutral White, Red, Light Blue, Dark Blue, Green and Purple 16 Different Color Settings with Smooth Color Transition, Single Color Fade, Medium Color Changing, and Fast Color Changing. No separate controller neeed just toggle power switch off and on to change color modes. Warning: Installing a 12 Volt bulb into a 120 Volt socket may permanently damage your pool's lighting system.