// Definition
The ability to adjust the wavelength composition of LED grow lights to target specific plant responses such as stretch control, resin production, and pest management. Advanced systems can produce hundreds of different spectrum profiles including far-red, blue, UVB, and HPS-equivalent spectrums.
// From the Episode
Major discussion topic in the second half of the chunk. Bubbleman spoke extensively about Grandmaster LED and Thomas's lights that can produce over 500 spectrum profiles. He described using cold blue light to prevent stretching and far-red to selectively stretch shorter canopy sections. SPEAKER_04 warned that far-red too early can ruin plants. The panel discussed side-by-side tests showing dramatically different plant morphology from the same clone under different spectrums. Thomas (GML/SPEAKER_08) joined live and clarified leaf surface temperature matching is more important than a blanket 5-degree temperature increase.