Does UV Light Actually Make Your Bud Stronger?

Why

UV lights come with a tempting promise: expose your plants to ultraviolet light, they produce more protective resin, and you harvest stronger bud.

Before buying another light, ask for a comparison: did buds grown with UV test higher in THC than buds grown without it?

First, UVA and UVB are types of ultraviolet light. UVA has longer wavelengths; UVB has shorter wavelengths. They can affect plants differently.

The claim has a scientific origin. A 1987 study found that UVB increased flower THC concentration. But those plants had much lower THC concentrations than many modern cultivars.

That’s evidence worth considering. It isn’t a guarantee for today’s grow.

In a modern University of Guelph trial, researchers didn’t find clear evidence that UVA or mixed UVA and UVB increased THC in the buds.

There are positive results, too. One small UVA study reported higher THC concentrations in two cultivars. However, its THC-dominant cultivar produced less flower. We need more controlled trials to know whether that THC increase is repeatable. And growers need to consider whether a higher THC percentage is worth harvesting less flower.

UV can change plant chemistry. What remains uncertain is a reliable potency benefit worth paying for.

The cultivar, wavelength, and exposure matter. A positive result with one treatment doesn’t validate every UV lamp. And visible frost alone cannot tell you the THC percentage.

If you already use UV, protect yourself, too. UV can harm your eyes and skin, so switch it off before working under it and follow the fixture’s safety instructions.

If stronger buds are your only reason for buying UV, I’d hold onto the money. Ask the supplier for tests of the same cultivar grown under comparable conditions, with and without that UV treatment. Look for results that repeat, and compare how much flower was harvested as well as its THC percentage.

Studies discussed: 1987 UVB study: https://doi.org/10.1111/j.1751-1097.1987.tb04757.x 2022 University of Guelph trial: https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.974018/full 2021 UVA study: https://www.scirp.net/journal/paperinformation?paperid=113836

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