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A CRI of 0 means all colors will appear black.

Color rendering index (CRI): measures how accurately a light bulb will render colors in a room.

Lux: measures the amount of lumens emitted per square meter.

Photosynthetic Photon Flux Density (PPFD): measures useful light intensity over a given area.

Watts: measures how much energy a bulb will consume when in use.

Other terms you may encounter when considering light intensity include: The higher the number of lumens of your bulb, the more light that bulb will produce–and the brighter it will appear. This is usually measured in lumens in the case of LEDs.

How much light a bulb or fixture provides depends on its intensity. Opting for a slightly warmer color temperature will give your space a cozy glow.

The unit Kelvin (K) measures the color temperature of individual bulbs–in other words, will the light emitted appear warm or cool? This becomes important when your grow lights also illuminate your living space. Some grow lights allow you to adjust the balance of color from warm (more red light) to cool (more blue light), depending on your plant’s needs. Green light helps maximize photosynthesis.Ī standard, full-spectrum grow light will support most plant growth.Red light regulates plant growth and helps plants produce flowers and fruit.It also helps encourage germination and root development in young plants and seedlings. Blue light helps plants produce chlorophyll, the pigment they need to grow.Contained within that spectrum are some colors especially helpful to indoor plants. This is known as a ‘full spectrum’ light. Although standard grow lights appear clear or white to the naked eye, they actually consist of multiple colors emitted in varying degrees. Most plants need a spectrum of color to thrive. To better understand the differences in grow lights on the market today, consider the following categories. Grow lights give plants the energy they need to convert light into food, but not all grow lights are the same.