E27 Halogen Bulbs
Halogen light bulbs are available in multiple shapes and sizes. For example, there are halogen bulbs with the well known E27 screw base. The E27 halogen bulbs have an excellent color rendering-index (CRI > 9) and are available in a (extra) warm white color temperature. They are also fully dimmable. Since september 2018, halogen bulbs are being outphased due to their inefficient energy use. There are however other E27 bulbs on the market that are way more eco-friendly like the E27 LED bulbs.