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

Cannabis Cultivation and Science Podcast

Tad Hussey.

Cannabis, Gardening, Natural Sciences, Cultivation, Leisure, Science, Home & Garden, Marijuana, Weed, Growing, Organics, Grow

4.7 • 716 Ratings

🗓️ 4 November 2025

⏱️ 61 minutes

🔗️ Recording | iTunes | RSS

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Summary

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.

Transcript

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0:00.0	Welcome to the Cannabis Cautilance Podcast. I'm your host, Tad Hussey of Kiss Organics.
0:23.0	This is the podcast where we discuss the cutting edge of growing from a science-based perspective
0:27.4	and draw top experts from around the industry to share their wisdom and knowledge.
0:31.7	Some exciting news about Kiss Organics is we've added a bunch of new IPM solutions on our website.
0:36.7	We are official distributors
0:38.3	of Bioworks now, meaning we can sell Epishield, Suffol X, Root Shield, Principal, which is their new
0:43.8	Bavaria product, cease, mill stop, and everything else they offer. I have direct access to their
0:49.1	pathologists and horticultural team and can put facilities directly in touch if it's helpful.
0:54.0	In addition, we also
0:54.9	carry Actinivate, Azagard, Grandivo, Pygannic, Regalia, Sanidate, PFR 97, and much more. Our prices
1:01.9	are lower than Arbico and we can do custom quotes on the commercial side. And we also have heavy metal
1:07.5	testing on our website through a partnership with cannabis chem lab for only $99 a test.
1:12.7	They are an ISO accredited laboratory and can test soil, fertilizer, water, and plant material
1:17.6	for more common heavy metals.
1:19.6	This is the most affordable testing option for heavy metals, so you can make sure you're
1:23.1	in the best position to pass in some of the tighter regulatory states. This is part two of my
1:29.0	conversation with Dr. David Hawley, Chief Science Officer at Fluence. If you haven't listened to
1:34.5	part one yet, I'd recommend starting there. We covered some core lighting principles like
1:38.8	DLI, human formity, and how plants actually perceive light. In this episode, we dig deeper into real-world
1:45.1	lighting strategy, how to scale these concepts and production environments, why fixture placement
1:49.8	and dimming schedules matter as much as spectrum, and how light interacts with temperature,
1:54.2	CO2, and plant morphology. We also touch on the future of photobiology, what's next in LED
	...

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