External sensor for electronic flash

Fiber-optic anti-cycling device for street lamps

Flash tube apparatus with delayed emission

Flash unit having plural flashlamps

Fluorescent lamp ballast with light output control

Full power light control

Gas discharge lamp system with automatic shutoff means

High intensity discharge lamp color

High-frequency power supply for incandescent lamp

Ignition circuit for extinguishing tubes in electronic flash equ

Incident metering electronic flash control

Instrument panel and EL lamp thereof

Inverter power supply for incandescent lamp

Lamp brightness control circuit with ambient light compensation

Lamp control circuit

Lamp oscillator for atomic frequency standards

LED stabilizing light source device

Light digitizing circuit for an electronic flash device

Light integrator circuit with built-in anticipation

Light intensity monitoring and adjusting apparatus for xenon lam