Why output fades quietly
The failure mode is decline, not breakdown. Dust on the lens, a film on the gobo, a seal that has started to let in moisture — each takes a little output, and together they turn a bright LED gobo projector into a disappointing one without anything ever actually breaking.
- Take a reference photo at install, under the conditions it will run in
- Repeat it annually, same hour, same house lighting
- Log any cleaning or gobo change with a date
- Compare before assuming the unit has failed
How to clean without damaging coatings
Frequency depends on the site, not the product. an LED gobo projector in a clean lobby needs attention once a year; one in a kitchen, a workshop or beside a road needs it quarterly. Set the interval from the environment and write it into the site calendar.
- Remove loose dust with a blower or soft brush
- Wipe with a lens cloth and a little isopropyl only
- Never use a household cleaner on coated optics
- Handle the gobo by its edge only
Gobo inspection and replacement
The gobo is the part that carries the image and the part most often blamed for a fault that is elsewhere. Check it against a light before assuming the optics have failed: a hairline crack or a patch of degraded coating shows up clearly when you tilt it. Keep the reference code so reorders are exact.
- Inspect against a light at an angle for cracks and crazing
- Look for marks that show in the image but not on the glass
- Replace rather than clean a degraded coated gobo
- Record the reference code for exact reorders
Heat, seals and electrical checks
Twice a year, check the things that cause failures: housing temperature after an hour at full output, the condition of the seals and gaskets, the tightness of the bracket, and the state of the cable gland. an LED gobo projector that is running hot, or whose gland has perished, will fail long before the LED reaches its rated hours.
Seasonal and event checks
Seasonal checks are about duty cycle, not optics. Run it for the length of the event, at the hour it will run, and confirm it does not cut out. Clean the optics at the same time and you will start the season at full output.
- Run a full duty cycle at the working hour
- Check for thermal cut-out after an hour or two
- Clean the optics before the season starts
- Confirm the timer and switch settings
What to keep on the shelf
The spares list is short because the failure modes are few. A spare glass gobo covers image damage; a spare control handset covers the most common support call; a recorded artwork reference covers everything else. Keep them together with the install record.
- A spare gobo, cut from the same artwork file
- A spare control handset or remote
- The artwork reference and reorder contact
- The install record with throw and settings
