AMERICAN ULTRAVIOLET Lesco SUPERSPOT MK III, Technical Reference Manual, Page: 23 / 54

KMM1002P
21
4.4. Manual Operation
4.4.1. Toggle Switch
In the Manual operation mode, the shutter remains open and UV light is continuously
emitted from the light exit end of the lightguide for as long as the footswitch is depressed.
If operating in the Manual mode, make sure that the shutter selector switch is in the
"Manual" position. See section 3.2.6.
4.4.2. Cure Cycle Operation
**WARNING**
UV light is hazardous to the eyes and skin. Do not operate the unit
without UV protective goggles and gloves. Make sure no one is
exposed to or is in a position to look at the light emitted from the light guide
unless they are also protected with UV protection goggles.
To expose substrate to UV light, turn the unit ON following the procedure outlined in
section 4.1.5. Hold light-exit end of lightguide away from substrate (make certain
lightguide end-tip does not come in contact with material), and press down on footswitch.
Shutter will open, and UV light will be emitted from the lightguide. To end UV emission,
release pressure from the footswitch (if in “Manual” mode) or wait for timed shutter open
period to expire.
4.4.3. Proper Light Exposure
UV light is most effective when it is perpendicular to the work surface; the effectiveness
drops to 50% when the angle of incidence is 60 degrees from the work surface, dropping
to zero when the light only grazes the work surface.
The UV light is emitted from the standard lightguide exit port in a 60
°
cone. Therefore, the
further away the lightguide is from the work surface, the lower the energy density
(milliwatts per square cm) and the higher the exposure time necessary to achieve the
desired results.
Note:
The bulb lifetime depends on the number of times it has been turned ON and
OFF. Turning the lamp ON, and the subsequent warm-up period until the lamp comes to
full power, degrades the bulb considerably more than continuous operation. For best
results, keep the lamp operating throughout the work shift.
Note: After the lamp has been turned off, it needs to cool down before it can be ignited
again. Allow approximately 2 minutes before one attempts to restrike the lamp.
**CAUTION**
Repeated attempts to restrike the lamp before it has
cooled down sufficiently may damage the power supply.