In The Mix

Light Interruption Can Cause Herms (+How to Stop It)


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Light interruption is one of the most overlooked risks in indoor facilities—and it often shows up after a build is “complete.”

In this breakdown, Egan O’Keefe (Co-Founder of Front Row Ag, VP of Cultivation at Story of Maryland) explains:

  • Why commissioning doesn’t end when the building is handed over
  • Where light leaks actually come from (doors, ductwork, equipment)
  • How even small LEDs can impact sensitive varieties
  • The difference between resilient vs. finicky genetics
  • Why green aisle lighting is a safer—but not perfect—solution

This is practical, field-tested insight for operators who want consistency, not surprises.

Chapters

00:00 – New facility mistake most teams make

00:30 – What commissioning actually means

01:15 – The hidden issue: light interruption

01:40 – Hallways, traffic, and light exposure

02:00 – Why most doors fail

02:20 – How to actually find light leaks

02:40 – Ductwork and mechanical system issues

03:00 – Fixing doors and sealing rooms

03:20 – Equipment LEDs and hidden light sources

03:50 – Why even tiny light matters

04:05 – Two types of genetics

04:45 – When light leaks don’t cause problems

05:00 – When they absolutely do

05:15 – How herms start from small light exposure

05:30 – Why early detection matters

05:40 – Green lighting in aisleways (pros & limits)

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In The MixBy Front Row Ag