Wattage, colour and finish
A 9W cool white and a 9W warm white are different products, and a customer who bought six of one will notice when the seventh does not match. Keeping wattage, colour temperature, finish and brand on the item means the invoice records exactly what was supplied — which matters when someone returns months later for two more to complete a room.
Warranty runs for years
LED warranties are two, three or five years, and the claim arrives with no paperwork. Recording brand, model and date on the invoice means you find it in seconds and pass the claim to the manufacturer instead of replacing it yourself. Across a shop selling volume, the difference between traceable and untraceable claims is a serious annual number.
Models change faster than stock moves
Lighting ranges are replaced frequently, and a model that has been discontinued does not become easier to sell with time. The movement report separates seasonal slowness from genuinely dead stock, and clearing the second group at cost while it is still current recovers capital that would otherwise sit in a box for two years.
Contractor and project supply
A contractor fitting out a building buys in quantity against a job paid at the end, often in batches as floors are completed. Deliveries recorded against the site, a credit limit set in advance, and a statement each month are what keep a large account readable — and what let you answer how much has gone to which floor when his engineer asks.