Critical Lights by Expert Seeds
A indica-leaning cross of Northern Lights Nr5 × Critical Mass, Critical Lights — released by Expert Seeds — shows up in a lot of tents for good reason. Indoors it typically finishes flowering in around 56 days after the flip to 12/12. The environment targets below are the same stage-by-stage bands the Cultivar journal grades real Critical Lights grows against.
🌿 Start a Critical Lights journal — free →
Similar strains
| Breeder | Expert Seeds |
|---|---|
| Type | mostly indica |
| Flowering time | ±56 days |
| Environment | Outdoors, Greenhouse |
| Lineage | Northern Lights Nr5 × Critical Mass |
🌱 Get Critical Lights seeds →
Affiliate link — supports Cultivar at no cost to you.
🧬 Explore the family: Critical Mass
Ancestry Pedigree
The Seed Bank
Original Strains
Mr Nice Seedbank
Original Strains
The Seed Bank
Cultivators Choice
Original Strains
Original Strains
Original Strains
Growing Critical Lights: what to expect
As an indica-leaning plant, expect a modest stretch after the flip (roughly 50–100%) and dense bud structure — which makes late-flower humidity discipline the main risk: keep RH in the 40s once buds fatten to stay ahead of mold. Growers familiar with Northern Lights Nr5 or Critical Mass will recognize much of its behavior. Whatever the listing says, the cut in YOUR tent is the ground truth: log feedings, readings, and photos, and let the trends — not the label — drive decisions.
Critical Lights FAQ
How long does Critical Lights take to flower?
Critical Lights typically flowers in around 56 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Critical Lights an indica or a sativa?
Critical Lights is listed as mostly indica.
What are the parents of Critical Lights?
Critical Lights was bred from Northern Lights Nr5 × Critical Mass by Expert Seeds.
What environment does Critical Lights like?
Standard cannabis bands work well: VPD 0.8–1.1 kPa in veg and 1.0–1.4 kPa in flower, with humidity stepping down from 65–75% as a seedling to 40–50% in late flower. See the stage-by-stage table on this page.
📷 Growing Critical Lights and something looks off? Free AI photo diagnosis →
Facts compiled from public breeder listings. Growing Critical Lights? A structured journal — with your feedings, readings, and photos — is how you find what THIS cut actually wants.
Track your own grow free — the journal grades your environment against these bands →
Get the one-page grow reference card
VPD, pH by medium, deficiency symptoms and dry/cure targets on a single printable page. Free — plus the occasional grow-data breakdown. No spam, unsubscribe in one click.