LS-450 Series Blue LED Pulsed Light Sources
LS-450 Series Blue LED Pulsed Light Sources
11
Bulb Replacement for LS-450 Series Light Sources
The LS-450 and R-LS-450 light sources come with a standard LED that emits blue light at approximately 450-470
nm (see Absolute Spectral Output graphic above). However, the LS-450 and R-LS-450 can accommodate LEDs
of different wavelengths, which are sold as accessories to the units.
Note: This section is not applicable to the USB-LS-450.
The LED is mounted in a silver reflector barrel, which allows easy insertion into and removal from the optical
housing of the LS-450 and R-LS-450. The reflector barrel also optimizes any stray LED light, resulting in
increased signal strength. Thus, you should never remove the LED from the reflector barrel.
To change the LED on the LS-450 and R-LS-450, you will need the following tools:
•
3/32 Allen wrench (LS-450 only)
•
1/20 Allen wrench
Changing a Bulb in the LS-450
To change the bulb in the LS-450, follow the steps below:
1. Ensure that the unit is off and that power is disconnected from the LS-450.
2. Use the 1/20 Allen wrench to loosen the small setscrew located on the bottom of the unit (between the set
of “fins” that protrude from the sides of the unit). If you remove the screw fully, place it in a safe place until
you replace it later in this procedure.
3. Use the 3/32 Allen wrench to remove the two screws on the bottom right and left corners of the rear end
of the LS-450. This allows the LS-450 to be separated into two pieces. Place these screws in a safe area.
4. Pull the two halves apart gently until they are approximately 1.5” apart. This should expose two thin black
wires that are holding the unit together. These wires connect to a small socket on the LED (located in the
front half of the unit).
5. Slide the LED barrel out of the front portion of the LS-450. If the unit does not slide out easily, you will
need to further loosen the setscrew (see Step 2).
6. Remove the blue filter, seated directly in front of the blue LED. Place the filter to the side. You will only
need this filter when using the blue LED.
7. Unplug the blue LED from the connection socket. Remove the socket by gently pulling the insulated black
wire back from the rear of the barrel. The socket should unplug easily
Note: If you want to reinsert the default blue LED in the future, identify the original LED orientation with
a small amount of liquid paper.
8. Seat the socket of the replacement LED firmly into the rear of the barrel (where the anode and cathode
lead pins are located). The orientation of the LED should be marked with a white dot on the side of the
barrel (cathode side) OR by differing pin lengths (the short pin is the cathode side of the LED).
9. Place the new LED barrel back into the optical housing of the LS-450 and tighten the setscrew on the
bottom (loosened in Step 2) so that the barrel is firmly set in the housing.
10. Reattach the two sides of the LS-450 together and replace the two screws you removed in Step 3. Ensure
that the black socket wires do not stray out of the LS-450 enclosure when you reconnect the unit.
11. Plug the unit into the 12 V power supply and turn the unit on. If the new LED does not illuminate when the
switch is in the On position, consult the troubleshooting tips at the end of this section.
