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Estimate how much light your tank needs. Common planted-tank benchmarks are roughly 20 lumens per liter for low light, 35 lm/L for medium light, and 50 lm/L for high light. Modern LED fixtures deliver about 90 lumens per watt.
Total rated LED watts of your fixture
Enter your tank volume and target light level, then press Calculate.
Lumens and wattage are rough proxies — PAR (photosynthetically active radiation) is what plants actually use, and it varies with fixture type, spread and depth. Use this as a starting point and adjust based on plant growth and algae.