Reef light transition tool

Spectrum-adjusted PAR target

Enter the PAR your coral is getting under the current light, then pick the new light. The app estimates a comparable PAR target using the relative 390–500 nm spectrum score.

Inputs

Current light Current PAR reading New light

Transition math

Equivalent new PAR = current PAR × (current score ÷ new score)

Output

Enter a valid current PAR reading.

Pick the current light and enter the PAR your coral is seeing now.

Pick the new light. The app adjusts using the relative 390–500 nm score difference.

Start at the conservative target if fixture geometry or mounting style changes significantly.

⚠ This estimate is based on relative spectrum scores from shared plots captured with all channels at 100%. It does not model optic differences, mounting height, fixture shape, puck spacing, or total-field distribution.