I am using these LEDs to replace old halogen lights in my kitchen ceiling. They are amazing! I like the 4000k (Kelvin) hue. For me 3000K is too yellow to see well and 5000K is blinding. We were about to replace all the lights in our house with 4000,000. The light from these lamps is whiter and brighter than that of the old halogen lamps. They were easy to install. At the end they have two small peaks. With our recessed ceiling lights, simply insert and turn the bulb. They work well, turn on instantly, no lags, no flickering or anything like that. I recommend these lamps. They're a lot better than the old hot halogen bulbs whose glass can't even be touched. Halogens kept burning out. They have a really good longevity. I look forward to not changing lightbulbs for a very long time. If my review was helpful, please let Revain know by clicking helpful. Many Thanks.