Catalyzes the reduction of fatty acyl-CoA to fatty alcohols. The preferred substrates are C24:0 and C26:0. May be unable to use saturated and monounsaturated C16 and C18 acyl-CoA as substrates. Involved in cuticular wax formation. a long-chain fatty acyl-CoA + 2 H(+) + 2 NADPH = a long-chain primary fatty alcohol + CoA + 2 NADP(+) Expressed in leaves, stems, flowers, siliques and roots. Detected in epidermal cells of leaves and stems, in trichomes and in the elongation zone of young roots. Glossy stem wax. Major decreases in primary alcohols and wax esters, and slightly elevated levels of aldehydes, alkanes, secondary alcohols, and ketones. Belongs to the fatty acyl-CoA reductase family.