A program trade order process and related market center are disclosed which accumulate program trade orders throughout the trading day and execute the accumulated program trade orders at a designated time. The EIR device can be provided by a bar code reading device, an RFID reading device, andor a card reading device. The intensifier intensifies the light incident on the detecting face of the photodetector, increasing the sensitivity of the ODS and improving the ability of the SPM to translate the actuator in the desired manner.