Episode 151: Light, Spectrum, and Plant Signals — A Practical Guide with Dr. David Hawley part 1

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

🗓️ 21 October 2025

⏱️ 58 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.
0:23.1	This is the podcast where we discuss the cutting edge of growing from a science-based
0:26.8	perspective and drawn top experts from around the industry to share their wisdom and knowledge.
0:31.6	Some quick updates before starting the podcast.
0:34.2	It's been a little while since my last podcast due to our hosting the first cannabis
0:38.6	cultivation and science conference in September at Collective Elevation in Bozeman, Montana.
0:44.0	There was some amazing growers, researchers, and experts I got to connect and personally network
0:49.2	with. And for our first conference, I felt like it went as well as it possibly could have,
0:53.7	and I'm excited to plan for the potential of hosting it again next year. We have not officially confirmed
0:58.9	for 2026, but the unofficial dates would be the last weekend in August of 26 if you want to
1:05.0	mark your calendar and plan ahead. Some other news is we've added a bunch of new IPM solutions on our website.
1:12.2	We are official distributors of Bioworks now, meaning we can sell EPS shield,
1:16.5	Suppoil X, Root Shield, Principal, their new Bavaria product, cease, millstop, and everything else they offer.
1:23.6	I have direct access to their pathology and science team and can put facilities directly
1:27.8	in touch if it's helpful.
1:29.6	In addition, we also carry Actinivate, Azagard, Grandivo, Pygannic, Regalia, Sanidate, PFR
1:36.1	97 and much more.
1:38.1	Our pricing is lower than Arbico and we can do custom quotes on the commercial side.
1:43.2	We have also added heavy metal testing on our website
1:46.3	through a partnership with cannabis chem lab for only $99 a test. They are an ISO accredited
1:52.3	laboratory and can test soil, fertilizer, water, and plant material for common heavy metals.
1:57.7	This is the most affordable testing option for heavy metals so you can make sure you're
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