Spider Farmer SF4000 PPFD & PAR Data
Spider Farmer · SF4000 · Grow
The numbers below are compiled from public sources: Spider Farmer’s own specification page and an independent PAR test. They are not our own measurements. Where a figure is only a manufacturer claim, or only an image we could not read as text, it is labelled that way. Each row says where the value came from.
What Spider Farmer publishes
Spider Farmer lists the SF4000 as a 450 W fixture and publishes an official PPFD map on the product page. That map is only an image — the grid values are not offered as text anywhere on the site — but the image itself is labelled with the hanging heights (12 in and 18 in) and prints a µmol/m²/s number at every grid position, tested in a 4×4 ft tent. We transcribe those printed numbers below. They are Spider Farmer’s own stated figures, read off its own chart image; they are not our measurement.
| Metric | Manufacturer stated | Source |
|---|---|---|
| Rated power draw | 450 W (±5%) | spider-farmer.com |
| PPF | 1170–1171 µmol/s | spider-farmer.com |
| PPE (efficacy) | 2.7 µmol/J | spider-farmer.com |
| Coverage (veg) | 5×5 ft | spider-farmer.com |
| Coverage (flower) | 4×4 ft | spider-farmer.com |
Independent PAR test
The most rigorous public third-party datapoint we could find is MIGROLIGHT’s bench test, summarised in a Spider Farmer round-up review. It reports an average PAR across the 4×4 ft footprint rather than a full grid, so it is directly comparable to the manufacturer’s flowering coverage claim.
| Metric | Manufacturer stated | Third-party measured | Source (measured) |
|---|---|---|---|
| Wall power draw | 450 W | 438 W | MIGROLIGHT via growlightcomparisonguide.com |
| Efficacy | 2.7 µmol/J | ~2.06 µmol/J | MIGROLIGHT via growlightcomparisonguide.com |
| Average PPFD over 4×4 ft | not stated per-area | 644 µmol/m²/s | MIGROLIGHT via growlightcomparisonguide.com |
PPFD map (per grid position) — manufacturer chart
Manufacturer stated, transcribed from Spider Farmer’s official SF4000 PPFD map image (product page, map file SF4000-2512-PPFD-Map), tested in a 4×4 ft tent. These are Spider Farmer’s figures read off its own chart, not our measurement. The chart is drawn as four nested squares (1×1, 2×2, 3×3, 4×4 ft) around a center point, so it is laid out by zone rather than as a plain grid.
Height: 12 inches
| Zone (footprint) | Corners — TL, TR, BL, BR | Edge midpoints — top, bottom, left, right | Center |
|---|---|---|---|
| Center point | — | — | 1821 |
| 1×1 ft | 1858, 1853, 1850, 1856 | — | — |
| 2×2 ft | 1635, 1633, 1636, 1631 | 1669, 1668, 1873, 1872 | — |
| 3×3 ft | 650, 649, 648, 960 | 964, 965, 1266, 1270 | — |
| 4×4 ft | 274, 273, 275, 271 | 484, 490, 599, 601 | — |
Height: 18 inches
| Zone (footprint) | Corners — TL, TR, BL, BR | Edge midpoints — top, bottom, left, right | Center |
|---|---|---|---|
| Center point | — | — | 1371 |
| 1×1 ft | 1349, 1344, 1341, 1347 | — | — |
| 2×2 ft | 1070, 1068, 1071, 1066 | 1179, 1178, 1242, 1241 | — |
| 3×3 ft | 527, 526, 525, 524 | 867, 868, 988, 992 | — |
| 4×4 ft | 360, 359, 361, 357 | 583, 589, 656, 658 | — |
All values in µmol/m²/s. On the 12 in chart the 3×3 ft bottom-right corner is printed as 960, far above the other three 3×3 corners (648–650); we reproduce it as printed rather than “correct” it, but treat that one cell as a likely chart artifact. The center hot-spot (1821 at 12 in, 1371 at 18 in) and the steep fall-off to the 4×4 ft corners (~270 at 12 in, ~360 at 18 in) are the figures that matter: raising the light from 12 to 18 in trades peak intensity for a flatter, wider spread, exactly as the coverage claims imply.
Sources
- Manufacturer specs and PPFD map (product page): https://www.spider-farmer.com/products/sf-4000-led-grow-light/
- Official PPFD map image transcribed for the grid tables: https://www.spider-farmer.com/wp-content/uploads/2026/03/SF4000-2512-PPFD-Map-Bridgelux-values-%E2%80%8B%E2%80%8Bsame-as-Samsung.jpg
- Independent PAR test (MIGROLIGHT, cited in a Spider Farmer review round-up): https://growlightcomparisonguide.com/spider-farmer-grow-lights/spider-farmer-grow-light-review
Notes
The measured wall draw (438 W) sits inside the rated 450 W tolerance. The gap that matters is efficacy: the manufacturer’s 2.7 µmol/J is a fixture-level photon-flux figure, while the independent ~2.06 µmol/J is derived from average PAR delivered over the actual 4×4 ft footprint, which is always lower than a best-case bench number. Corner PPFD is where most lights fall short of the rated coverage: Spider Farmer’s own chart shows the 4×4 ft corners dropping to ~270 µmol/m²/s at 12 in — roughly a seventh of the center reading — which is the honest limit of the 4×4 ft flowering claim and the number a canopy at the edge of the tent actually sees.