By convention, yellow-red colors (like the flames of a fire) are considered warm, and blue-green colors (like light from an overcast sky) are considered cool. Confusingly, higher Kelvin temperatures (3600–5500 K) are what we consider cool and lower color temperatures (2700–3000 K) are considered warm. Cool light is preferred for visual tasks because it produces higher contrast than warm light. Warm light is preferred for living spaces because it is more flattering to skin tones and clothing. A color temperature of 2700–3600 K is generally recommended for most indoor general and task lighting applications. Color Temperature is not an indicator of lamp heat.
Newly created vintage and filament LED bulbs offer color temperatures below 2700K, some even as low as 1900K! These color temperatures are suited for those looking to mimic the ambience created by traditional carbon filament bulbs. These bulbs produce a lower number of lumens than traditional incandescent bulbs as do their LED counterparts. Only chose this level of color temperature if you are willing to sacrifice lumens for a more ambience that demands the extremely soft light these bulbs create.