Indoor Yield Tracks Light Watts

What actually sets indoor yield

Two inputs

Aromagenetics set the ceiling

Your controls

Example strains

light feed water heat and CO2 all matter indoors

Main levers

Example strains

light CO2 and temperature usually move harvest weight the most

Easy rooms

Aromaheat is simple to manage, and a door cracked open can hold ambient CO2

Left variable

Aromaonce those are stable, watts on the canopy drive the numbers

HPS gram-per-watt ranges

Rule of thumb

each watt of HPS often returns about 0.375 g to 1 g of dried flower

150 W

expect roughly 50 to 135 g; small lamps waste more watts as heat and stray light

250 W

expect roughly 85 to 225 g, still less efficient than larger HPS bulbs

400 W

expect roughly 130 to 350 g, a bit less per watt than a 1000 W lamp

600 W

expect roughly 250 to 660 g; this size is the most efficient HPS listed

1000 W

expect roughly 375 to 1000 g when the canopy and climate keep up

Why the range is wide

Variety: some cultivars pack on flower; others stay modest even under the same lamp.

Method: training, plant count, and how full the canopy is change the result.

Mix lamps: HPS plus fluorescents or LEDs can fill gaps, but count the real watts on the plants.

Low estimate: about 0.25 g per watt of the smallest lamp you would use in that setup.

High estimate: about 1 g per watt of the largest lamp in that setup.

Planning takeaway

Order: size the lamp to the harvest, then size the footprint to the lamp.

Timeline: modern 7 to 9 week flower varieties can hit these ranges when the room is dialed.

Ceiling: do not expect the top number from a weak variety or a half-empty canopy.

Other inputs: water and feed rarely cap an indoor room if you stay on schedule.