Three questions, not one brightness setting
Intensity asks how much light reaches a particular area. Plant-light
measurements commonly use photosynthetic photon flux density, or PPFD.
A daily light integral, DLI, adds the light received over a whole day. Spectrum
describes how that light is distributed across wavelengths. Timing describes
the daily light and dark periods. A brighter lamp is not automatically a
different spectrum.

These terms make different questions possible: is the illumination even across
the plants? Does the daily exposure fit the growing stage? What is being
changed when a lighting setting changes? A useful comparison therefore
needs more than the apparent colour of the lamps.
What controlled research can tell us
In a 2021 indoor experiment, increasing light affected flower yield,
photosynthesis and chemical measures differently. It is a useful reminder to
measure the outcome of interest rather than assume that growth and
composition move together .

A separate study compared four spectra in three cannabis cultivars.
Cannabinoid responses depended on the cultivar . That result does not identify a single universally superior lamp, nor demonstrate a flavour improvement in Flowa flowers.
Common questions
  • Does full-spectrum mean the same thing as sunlight?
    No. The label alone does not specify the complete spectral distribution or
    reproduce the changing conditions of an outdoor day.
  • Does more light always mean more terpenes?
    No universal rule follows from the studies discussed here. Intensity, spectrum,
    cultivar and the measured outcome have to be considered separately.
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