Design neat ceiling lights for gardens and growrooms. Choose fixture style and set safety margins. See results above, then download CSV or PDF files.
Use this for grow rooms, greenhouses, potting sheds, and covered beds.
These examples show how spacing changes with height and overlap.
| Room (m) | Height | Beam | Overlap | Recommended spacing | Typical total |
|---|---|---|---|---|---|
| 6 × 3 | 2.4 | 90° | 20% | ~3.84 | 6–8 fixtures |
| 8 × 4 | 2.8 | 110° | 30% | ~4.95 | 6–10 fixtures |
| 10 × 6 | 3.2 | 90° | 35% | ~4.15 | 12–18 fixtures |
1 Lit diameter at the plant plane:
2 Recommended spacing with overlap:
3 Auto fixture counts (per direction):
This is a planning model. Real fixtures differ by optics, reflectors, and mounting tilt.
Ceiling fixtures shape plant‑level light using beam angle and mounting height. This calculator models each fixture as a cone, estimating the lit diameter where crops grow. Larger angles or higher mounting heights increase diameter, allowing wider spacing. Narrow optics concentrate light and usually need tighter spacing to avoid dim bands between rows.
Overlap is the intentional crossing of adjacent beams. A 20% overlap means centers are placed at 80% of the estimated lit diameter. In dense foliage, overlap helps reduce shadowing and creates steadier readings when you spot‑check with a meter. Lower overlap can suit open benches or walkways where uniformity is less critical.
Walls, glazing, and condensation zones can steal usable light or create glare. The edge offset trims the layout so fixtures start away from the perimeter, improving safety and maintenance access. Optional aisle clearance reserves a central strip without fixtures, useful for carts, irrigation manifolds, or trellis service routes inside a growroom or greenhouse bay. When aisles are wide, consider a second lighting zone dedicated to paths.
Auto mode chooses row and column counts based on usable dimensions and the recommended spacing target. Manual mode locks counts when you must match existing junction boxes, cable trays, or framing members. After selection, the tool reports the achieved spacing in each direction, plus the implied overlap, so you can judge whether the layout stays within your uniformity goal. For large bays, compare the total fixture count against circuit limits and heat load targets before purchasing materials.
The placement preview lists the first coordinate points to verify the pattern quickly. Use grid for straightforward wiring runs and simple symmetry. Choose staggered to blend hotspots by shifting alternate rows, especially in long beds. Always confirm clearances from sprinklers, fans, heaters, and hanging baskets before final installation drawings. Record final coordinates for each circuit to simplify troubleshooting later.
Use the distance from the fixture to the target plane, such as canopy height or bench top. If plants grow taller, enter an average or the tallest expected height for safer uniformity.
Most fixtures list beam angle on the spec sheet. If only distribution type is given, choose a typical value: narrow optics are lower angles, wide diffusers are higher angles.
Many garden rooms use 15–35% overlap for smoother coverage. Start near 20% and adjust after checking plant response and light measurements across the bed surface.
Manual mode fixes your fixture count, so spacing becomes whatever fits the usable room size. The results show the achieved overlap, helping you decide whether to add or remove fixtures.
Grid is easiest to wire and align with framing. Staggered can reduce visible stripes and mix bright spots, especially when beams are narrow or beds are long.
No. CSV and PDF are generated in your browser and downloaded directly. This keeps the tool lightweight and avoids storing garden layout details online.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.