Free aquarium lighting calculator. Calculate required lumens and PAR values for your tank based on size, depth, and plant or coral requirements.
PAR measures light useful for photosynthesis. Low-light plants need 20-50 PAR, medium-light need 50-100, high-light need 100+ PAR. Measure PAR at substrate level for accurate assessment.
Most planted tanks do well with 8-10 hours of light daily. Too little light slows growth; too much promotes algae. Use a timer for consistent photoperiod. Adjust based on plant growth and algae levels.
This calculator uses standard lumen and PAR guidelines. Actual light reaching plants depends on water clarity, tank depth, and light angle. Use a PAR meter for precise measurement.
LED lights are energy-efficient and customizable. Fluorescent lights are affordable but less efficient. Metal halide lights are powerful but generate heat. Choose based on tank type and budget.
Regular household lights lack the spectrum for plant growth. Use aquarium-specific lights with appropriate color temperature (5000-7000K for plants). Avoid incandescent lights due to heat generation.