As of January 1st, 2018, California has implemented new standards for light bulbs sold within the state. These standards require that all light bulbs must be at least as energy efficient as federally mandated standards. This means that any light bulb sold in California must use less than or equal to 60 watts of power. Additionally, these bulbs must have a luminous efficacy of at least 45 lumens per watt.
There are a few different types of light bulbs that meet these requirements. One popular option is LED bulbs. LED bulbs are extremely energy efficient and can last for many years without needing to be replaced. Another option is CFL bulbs. While CFLs are not quite as energy efficient as LEDs, they still use significantly less power than traditional incandescent bulbs and can last for several years before needing to be replaced.
If you live in California and are in the market for new lightbulbs, make sure to look for ones that are California compliant!