# Episode 152: Light, Spectrum, and Plant Signals — A Practical Guide with Dr. David Hawley part 2

Page: https://stenobird.com/podcast/cannabis-cultivation-and-science-podcast-224812/episode-152-light-spectrum-and-plant-signals-a-practical-guide-with-dr-david-hawley-part-2
Text version: https://stenobird.com/podcast/cannabis-cultivation-and-science-podcast-224812/episode-152-light-spectrum-and-plant-signals-a-practical-guide-with-dr-david-hawley-part-2.md
Podcast: [Cannabis Cultivation and Science Podcast](https://stenobird.com/podcast/cannabis-cultivation-and-science-podcast-224812)
Published: 2025-11-04T18:22:22+00:00
Episode link: https://www.kisorganics.com/pages/podcast
Audio file: https://afp-901980-injected.calisto.simplecastaudio.com/eb565bbc-b99d-4ea2-a59e-7c4a2ca16b15/episodes/34429851-d522-4dee-b6a1-050b44216bdd/audio/128/default.mp3?aid=rss_feed&awCollectionId=eb565bbc-b99d-4ea2-a59e-7c4a2ca16b15&awEpisodeId=34429851-d522-4dee-b6a1-050b44216bdd&feed=WsEnHj2A
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Duration seconds: 3647

## Resource

In this episode, I sit down with Dr. David Hawley to talk about what plants actually care about when it comes to light. We dig into how to think in DLI instead of just chasing PPFD numbers, why uniformity matters more than raw power, and how spectrum fine-tunes rather than defines your grow. David breaks down what far-red and UV really do (and don’t do), how to manage leaf temperature as light intensity climbs, and why clean lenses and smart dimming often beat a fancy new fixture. It’s a practical, myth-busting chat about using light as a tool—not a trophy—and it’s packed with tips you can apply right away whether you’re running a living soil facility or just trying to dial in a tent at home.

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## Transcript

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