Light isn’t just for looks in a reef tank—it’s essential to coral survival. Corals rely on symbiotic algae called zooxanthellae to photosynthesize light into nutrients. Without proper lighting, your corals can lose color, recede, or even die.
Whether you’re keeping softies, LPS, or SPS, understanding how spectrum, intensity, and placement work is the key to thriving corals.
PAR stands for Photosynthetically Active Radiation—the specific range of light (400–700nm) that corals use for photosynthesis. It’s not about how “bright” the light looks to us, but how effective it is at driving coral growth.
You can measure PAR with a PAR meter, helping you dial in the perfect placement for each coral species.
Coral Type | Ideal PAR Range | Recommended Spectrum |
|---|---|---|
Soft Corals | 50–150 PAR | 8,000K–12,000K white with moderate blue |
LPS Corals | 100–250 PAR | Blue spectrum (420–460nm), moderate intensity |
SPS Corals | 200–400 PAR | High blue/violet spectrum, strong intensity |
🧠 Tip: Place softies lower in the tank, LPS in the middle, and SPS near the top where light is strongest.
hoosing the right fixture can make a huge difference. Here are three top-tier options:
Premium spectrum blending
App-controlled settings
Ideal for SPS and mixed reefs
Great balance for all coral types
Excellent value
Modular mounting options
Natural shimmer
Dense Matrix LED for deep penetration
Popular with LPS-focused setups
Mount lights 8–12 inches above the waterline for even coverage.
Use diffusers to reduce shadowing in mixed reefs.
When adding new corals, use the light acclimation method: start at low intensity and increase over 7–10 days.
💡 Use a PAR meter to test real values in your tank. Visual guesswork isn’t enough!
❌ Using outdated bulbs (T5 or MH with faded output)
❌ Blasting whites at 100%—this causes stress and algae
❌ Placing SPS in low-PAR areas
❌ Switching light schedules too often
Your lighting system is the backbone of your reef’s success. Whether you’re showcasing vibrant torches or growing dense SPS colonies, dialing in your spectrum and PAR is a non-negotiable step.
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