Types of Grow Lights

Tube Lights

Tube lights come in several flavors, but there’s a clear winner you should pretty much always choose.

You’ve seen the T5, T8, and T12 stuff, right? Well, the ‘T’ just means tube, while the number denotes the diameter in eighths of an inch. Therefore, a T5 is a tube light with a diameter of 5/8 inches. Tube lights can come in any length, but 1, 2, 4, and 8 foot are most common.

Also, tube lights will often come in a large fixture with multiple tubes. These are meant for scaled-up growing operations and are accordingly more expensive.

As it turns out, you should really only ever buy T5 lights. Both of the other kinds are older technology that is significantly less efficient. T5s last longer, use less energy, and produce more light.

What are Grow Lights?

“Grow light” isn’t a technical term, nor is it a unique piece of technology. Any light can be a “grow light” since plants really aren’t that picky about where the light comes from.

What sets grow lights apart from regular lights is the spectrum of light they emit when powered. Your typical lamp uses “soft” and/or “warm” light (which are terribly vague, informal descriptors of light quality and intensity). They tend to be yellowish and fairly weak as far as lumens (light power) are concerned.

Grow lights are often (but not always) “full spectrum” lights. That means they contain the full visible spectrum of light, from red to violet, plus a little extra on both sides – a touch of ultraviolet light can be beneficial. These lights are often described as “white/blue” or “cool” or “daylight”.

So, no, they don’t function any differently than other lights. The spectrum a lightbulb produces is determined by the components with which they are manufactured.

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