Grow Light Visualizer

Welcome to the Unlikely Gardener's Grow Light Visualization Tool! This interactive calculator helps you to plan and optimize your indoor growing setup by visualizing light coverage patterns and calculating PPFD (Photosynthetic Photon Flux Density) values at different heights. It doesn't deliver a PAR Map like the PAR Map Generator, but both can be used together to get a better idea of how light coverage is affecting your plants.

Simply select your light type, enter the specifications from your product documentation, and adjust the height to see how your grow light will perform. The tool shows you coverage areas from multiple viewing angles and provides real-time calculations to help you achieve optimal light distribution for your plants.

Fixture

Load a Preset Fixture

Light Type Shape of your grow light fixture

Spec Type Most spec sheets give PPFD at a height; quantum-board panels often give total PPF instead

Peak PPFD μmol/m²/s From product spec sheet

Total PPF μmol/s From product spec sheet

Spec Measured At in Height used for the PPFD measurement above

Beam Angle °

Total beam spread — if unknown, use 120°

Dimensions

Length in Longest fixture dimension

Width in Shortest fixture dimension

Diameter in Circular fixture diameter

Position & Angle

Mount Height in 12" Distance from light to plant canopy top

Tilt Angle ° 0° 0° = perpendicular; beam automatically aims toward the plant

Photoperiod hrs/day Hours per day the light runs — used for DLI

Show Target Area

Enable Plant Model

Plant Dimensions

Canopy Diameter in Side-to-side spread of canopy

Canopy Depth in Top of canopy to lowest leaves

Plant Position (offset from directly below light)

Left / Right offset in 0" Negative = left, positive = right

Front / Back offset in 0" Negative = back, positive = front

Foliage Density

Sparse Few leaves, lots of light passes through (succulents, cactus) Average Typical foliage — most tropical houseplants Full / Dense Heavy canopy, lower leaves heavily shaded (herbs, leafy greens)

Top View — PPFD Heatmap

Side View — Beam Profile

— Below Light
μmol/m²/s

— Beam Center
μmol/m²/s

— Beam Footprint
inches

— Coverage Area
sq ft

— Tilt
degrees

— DLI Below Light
mol/m²/day

Note: PPFD values are approximations based on a distributed-emitter inverse-square law with a Lambertian beam pattern. Actual readings vary by LED arrangement, optics, and reflectors. Always verify with a quantum (PAR) meter.

Important Notice

PPFD values shown are approximations only and representative of the most intense portion of the light output at the height shown. This tool calculates light distribution based on treating your grow light as a single point source rather than calculating the individual contribution of every LED in the array. Actual PPFD values may vary significantly depending on LED arrangement, lens design, reflector configuration, and other factors. For precise measurements, use a quantum meter (PAR meter) to measure actual light levels in your growing environment.