Calculate lumens, fixture count, spacing, and coverage. Adjust mounting height, beam angle, and losses easily. Grow healthier plants with balanced light across every workspace.
| Shop Area | Target fc | Fixture Lumens | Utilization | Maintenance | Estimated Fixtures |
|---|---|---|---|---|---|
| 192 sq ft | 40 | 4000 | 70% | 85% | 4 |
| 384 sq ft | 50 | 6000 | 75% | 85% | 6 |
| 600 sq ft | 60 | 8000 | 78% | 88% | 7 |
| 900 sq ft | 70 | 10000 | 80% | 90% | 9 |
Area = Length × Width
Required Lumens = Area × Target Foot-Candles
Effective Lumens Per Fixture = Fixture Lumens × Utilization Factor × Maintenance Factor × Reflectance Adjustment
Fixtures Needed = Required Lumens ÷ Effective Lumens Per Fixture
Achieved Foot-Candles = Delivered Lumens ÷ Area
Lux = Foot-Candles × 10.764
Estimated PPFD = Lux × Conversion Factor
Beam Radius = tan(Beam Angle ÷ 2) × Mounting Height
Coverage Area = π × Beam Radius² × Coverage Factor
Daily kWh = Total Watts × Hours ÷ 1000
Monthly Energy Cost = Daily kWh × 30 × Electricity Rate
Enter the shop length and width first. Add your target brightness in foot-candles for seed starting, potting, storage, or general plant care.
Then enter fixture lumens, wattage, utilization factor, and maintenance factor. These values help estimate real delivered light instead of rated output only.
Use beam angle and mounting height to understand coverage. Reflectance helps adjust for white walls, benches, and surfaces that return light.
Energy and cost fields estimate running expense and setup budget. After submission, the result appears above the form and below the header.
Garden workspaces need reliable light. Potting, trimming, seed starting, and inspection all depend on visibility. A lumen calculator helps size fixtures before buying. That reduces waste. It also improves plant care and daily comfort.
Not every corner needs the same output. A storage wall may need modest brightness. A propagation bench often needs stronger light. This tool estimates practical lumens for the whole area. It also checks how many fixtures may be needed.
Rated lumens are not the same as delivered lumens. Dust, height, beam spread, and aging reduce usable light. Utilization and maintenance factors help account for those losses. That makes the estimate more realistic for workshops and greenhouse rooms.
Spacing matters as much as raw output. Wide fixture spacing creates dim patches. Tight spacing improves balance but may increase cost. The calculator suggests coverage and spacing, helping you build a layout that supports even work light and better plant exposure.
Grow rooms and garden sheds may run lights many hours daily. Small wattage differences can change yearly cost. This page estimates daily use, monthly consumption, and annual expense. That helps compare efficient fixtures against cheap but power-hungry options.
Lumens serve human vision. Plants respond to photon density. This calculator adds a simple PPFD estimate using a conversion factor. It is useful for rough planning. Final grow-light decisions should still consider crop type, spectrum, and growth stage.
General potting and storage often work around 30 to 50 foot-candles. Detailed work areas may need 50 to 75. Seedling zones usually need stronger plant-focused lighting.
They reduce rated lumens to a more realistic delivered value. Real fixtures lose output from height, dirt, optics, room shape, and aging.
Lumens help for workspace brightness and basic estimates. For crop performance, PPFD and spectrum matter more because plants do not see light like humans.
Beam angle affects spread. A wider beam covers more floor area but lowers intensity at a given height. A narrower beam concentrates light more strongly.
Use a height that balances coverage, glare control, and access. Higher mounting broadens spread. Lower mounting raises intensity but reduces coverage area.
It gives a quick estimate from lux to PPFD. Different fixture spectra can shift the result, so treat it as a planning shortcut.
Yes. It works for workshops, sheds, garages, and indoor gardening rooms. Just enter the correct area, target brightness, fixture data, and energy rate.
Your target brightness may be high, or effective lumens may be reduced by losses. Wider spaces and long operating hours also influence practical planning choices.