THC Photoperiod & Lighting Schedule

Lighting schedule

Schedule name

Plant stage

Lights on

Light hours

Representative peak / plateau PPFD (µmol·m⁻²·s⁻¹)

Dawn ramp (minutes)

Dusk ramp (minutes)

Ramp model

Ramp model is a planning assumption, not a fixture measurement. Linear uses a 50% average-output factor. Slow-edge models more ramp time near low output (⅓ equivalent); fast-edge models more time near high output (⅔ equivalent). Use Light Lab variable blocks when you have measured ramp data.

00:0006:0012:0018:0024:00

Solar clock reference

Optional planning reference only. Enter coordinates and the local UTC offset manually. The calculator estimates standard sunrise/sunset using a civil-sunrise zenith assumption (90.833°); it does not use device location and it does not decide what photoperiod is biologically appropriate.

Date

Latitude (°)

Longitude (°)

UTC offset (hours)

Lights-on offset from sunrise (min)

Lights-off offset from sunset (min)

Enter date, coordinates and UTC offset to calculate a solar reference.

Assumption boundary: UTC offset must match the date you are planning, including daylight-saving time where applicable. Terrain, buildings, atmospheric conditions and local horizon effects are not modeled.

Interpretation

Photoperiod controls timing. PPFD describes instantaneous photon flux. DLI describes integrated daily exposure. Changing one does not automatically preserve the others.

Compare saved schedules

Schedule A

Schedule B

Choose two saved schedules to compare.

Field	Schedule A	Schedule B	Change
Choose two saved schedules to compare.

Saved	Name	Stage	Lights on	Clock hours	Dawn / dusk	Equivalent hours	PPFD	DLI

Most recent change

—Δ light hours

—Δ PPFD

—Δ DLI

—lights off