Possibility of a completely-controlled plant factory using red laser diodes (LD) together with blue LD or light emitting diodes (LED) is discussed. It is shown that laser plant factory (LPF) may be materialized if the price of LD becomes several handreds yen per 1W of output power. Recent rapid progress and price reduction of LD for digital video disc (DVD) support the realization of LPF in near future.
