Lighting is one of the most important aspects of a successful reef tank—especially when it comes to coral health and coloration. Yet, many beginners overlook the complexity of lighting. This guide covers everything you need to know to provide your corals with the proper light intensity and spectrum.
Corals rely on photosynthesis via symbiotic algae called zooxanthellae. These algae need the right amount of PAR (Photosynthetically Active Radiation) and proper spectrum to thrive.
PAR (μmol/m²/s) measures usable light for coral photosynthesis. Different coral types require different intensities:
Coral Type | Ideal PAR Range |
|---|---|
Soft Corals (Zoas, Mushrooms) | 50–100 |
LPS (Hammer, Torch, Acan) | 75–150 |
SPS (Acropora, Montipora) | 200–350 |
🔹 Tip: Too much PAR can bleach corals; too little leads to dull colors and stunted growth.
Spectrum Band | Role |
|---|---|
420–460 nm (Blue) | Drives photosynthesis and enhances coral fluorescence |
500–600 nm (Green-Yellow) | Aids visual appeal but less critical |
6500–10000K (White) | Mimics natural sunlight, supports growth |
Actinic (420 nm) | Boosts coral pigmentation and aesthetics |
💡 Tip: Blue-dominant lighting (around 20,000K) is often preferred for both growth and coral coloration.
Your reef tank likely has light zones:
Top Zone (High PAR): SPS, clams, and high-light LPS
Mid Zone (Moderate PAR): Euphyllia, Zoanthids, Ricordea
Bottom Zone (Low PAR): Mushrooms, GSP, soft corals
🔹 Avoid placing high-PAR species like Acropora at the bottom of the tank.
PAR Meter: Invest in a handheld meter (e.g., Apogee or Seneye)
Schedule: Run lights 8–12 hours/day; start low and ramp up intensity weekly
LED, T5, or Hybrid: LEDs offer control; T5s provide even spread; hybrids combine both.
💡 Running lights at full power too soon
🧼 Not cleaning lenses or splash shields
🔄 Changing spectrum/settings too often
🐠 Placing light-demanding corals in shaded areas
Lighting doesn’t need to be intimidating. By understanding PAR, spectrum, and proper placement, you’ll create a thriving environment for your corals. Start slow, observe coral response, and adjust your lighting for the long-term health of your reef.
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