import type { LedRoiInput, LedRoiResult } from './types.js';
/**
 * Calculate LED lighting retrofit ROI.
 *
 * energySaved = fixtureCount × (oldWatts − newWatts) × hours / 1000
 * costSaved = energySaved × rate
 * payback = totalInvestment / costSaved
 * co2Saved = energySaved × co2Factor
 *
 * @param input - LED retrofit parameters
 * @returns LED ROI result with energy savings, cost savings, and payback
 */
export declare function ledRoi(input: LedRoiInput): LedRoiResult;
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