16
3.2
Controls
3.2.1
Power Switch
Main power switch turns unit off/on.
3.2.2
LED Control Switch
This is a three-position toggle switch that is used to manually turn the LED on, off, or
activate TTL switching through the TTL-IN BNC connector.
ON: Manually turns on the LED for manual control.
OFF: The intensity of the LED is controlled via voltage range of 0-5 VDC applied to
ANALOG-IN.
TTL: LED on/off state is controlled by TTL triggering (via TTL-IN). Note that remote analog
control (via ANALOG-IN) is turned off when using TTL-IN.
3.2.3
ANALOG-IN Control Switch
Selects between LED dimming control through the ANALOG-IN BNC connector (REMOTE)
or manually using the INTENSITY (PWM) control knob (LOC-1).
REMOTE: Allows for the dimmed state of the LED to be controlled by a voltage (0 – 5 VDC)
applied to ANALOG-IN. The LED Control Switch must be set to OFF in order for dimming
via analog remote input to function properly. When controlling the LED’s dimmed state in
this mode, the status display turns blue.
LOC-1: Allows the INTENSITY (PWM) knob to control the dimmed state of the LED. For the
INTENSITY (PWM) knob to be effective, the LED Control Switch must be set to ON or TTL.
3.2.4
INTENSITY (PWM) Control Knob
Intensity (PWM) Knob: This knob dims the LED via Pulse Width Modulation. In essence, the
LED is being switched at 30KHz. This is the preferable mode of dimming for most
applications, as the LED will run cooler, and exhibit no color shift in the special output as the
light is dimmed. For the INTENSITY (PWM) knob to be effective, the LED Control Switch
must be set to ON or TTL.
The control of the intensity via PWM can also be controlled externally by connecting a 0-5
VDC source to ANALOG-IN connector. This external control is enabled by turning the
ANALOG-IN switch to the LOC-1 position and the LED switch to either ON or TTL. Note
that when PWM intensity control is set up for external control, the INTENSITY (PWM)
knob is disabled.
3.2.5
CURRENT Control Knob
Current Knob: Dims LED by adjusting the current delivered to the LED. Current control
may cause color shift in the LED’s spectral output. However, current-controlled dimming
may be preferable in situations involving the use of ultra high-speed cameras. For the
CURRENT knob to be effective, the LED Control Switch must be set to ON or TTL.
Note that the CURRENT knob is functional regardless of the positions of the LED and
ANALOG-IN switches, and manual or external state of intensity via PWM (manually
adjusting INTENSITY (PWM) knob or applying 0-5 VDC on ANALOG-IN input).
LAMBDA HPX HIGH-POWER LED LIGHT SOURCE SYSTEM OPERATION MANUAL – REV. 1.03E (20141208)
