What is a Compact Fluorescent (CFL) Bulb?

Compact fluorescent bulbs are spiral fluorescent bulbs featuring a standard E27 base and a built-in ballast, so they can be used in any standard household light socket. They are best known for being a longer lasting, more energy-efficient alternative to incandescent bulbs.

Can I use a compact fluorescent bulb as a grow light?

You can, though it’s not the most effective option and it’s not the preferred choice for anything more extensive than a small personal grow setup. Growers who use CFLs should choose:

• Cool white bulbs between 5000-6500K for vegging
• Warm white bulbs between 2700-3500K for flowering