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Lightspeed Technologies has expanded the HPLS series of interchangeable high intensity LEDs to include analog and digital modes in addition to HPLS systems with continuously variable output by manual adjustment. Configurations include optics for applications in fluorescence imaging, microscope imaging, high speed imaging, photosynthesis research, solar cell testing, detector testing and other applications that can use continuous, variable or digitally controlled narrow bandwidth visible or broadband white light. In the analog mode, the optical output follows the input signal (sine, saw, or any other) with a user-selectable format (0-5V, 0-10V, 0-20mA, 4-20mA), full optical power as much as 400mW and the speed of 500kHz. Short-pulsed, externally triggered digital mode (TTL/CMOS input) provides short rise and fall times (<150ns) and increased up to eight times peak optical power. Pulses can be implemented to <120ns. Dual trigger allows simultaneous analog and digital control of the HPLS where short pulsed applications require a biased optical background of matching geometry. LIGHTSPEED TECHNOLOGIES Campbell, Calif. www.light-speed-tech.com.