Fixture · Kessil · LED panel
Kessil AP9X
Single-fixture replacement for a 4-foot tank. Heavy and expensive but covers what would otherwise be 2-3 pucks.
At a glance
- Max draw
- 400 W
- Coverage
- 48″ × 24″ at 10″
- Mounting height
- 10″
- Street price
- $1200
PAR at depth (μmol/m²/s)
| Depth | Center | Edge | Notes |
|---|---|---|---|
| 6″ | 820 | 280 | |
| 12″ | 540 | 200 | |
| 18″ | 340 | 130 | |
| 24″ | 220 | 80 |
All readings corrected for underwater use. Center = directly under fixture; edge = at the 48″ × 24″ footprint edge. PAR varies by individual fixture setup, mount type, and tank glass — use these as a sizing baseline, then measure with your own meter.
Spectrum channels
- uv
- royal blue
- blue
- cyan
- warm white
- cool white
Best for
- 4-foot SPS tanks
- Single-fixture replacements for halides
Pros
- + One fixture, no spacing math
- + Kessil shimmer at 4-foot scale
- + Quiet (no fans)
Cons
- − Heavy mounting requirements
- − $1.2k commits you
Where to buy
Affiliate links
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PAR data source
BRS lighting test + community readings.
Next steps
- Correct your PAR meter reading using the PAR underwater calculator — uncorrected, the Apogee MQ-500 reads about 24 % low underwater (×1.32) and the older MQ-200 about 7 % low (×1.08); the MQ-510 corrects itself.
- Convert peak PAR to DLI with the DLI calculator — that's the metric corals actually care about.
- Reference the lighting guide for PAR targets by coral type.
Last reviewed