I asked
@mknauss to come and comment.
I don't know or understand these lights, but they are removable. Don't know if it is possible for algae to be in/behind these.
From the manual:
1. Switch off electrical switch or circuit breaker at the source,
2. Remove Junction Box or Transformer cover. Disconnect the light wires and attach a fish tape to the existing light power cord. This will assist in pulling the replacement light power cord through the conduit back to the junction box.
3. Remove the GloBrite color light assembly from the pool or spa water: Using the provided installation tool (P/N 620057), rotate the light assembly counter-clockwise about a 1/8th turn to release the light from the niche as shown on page 11).
4. Slowly pull the light and attached power cord (with attached fish tape) out of the niche. Pull the light’s power cord and fish tape out of the niche and place the light on the deck.
5. Attach the new light power cord to the fish tape and carefully feed the fish tape and cable to the junction box.
6. Install the light into the niche: Place the light installation tool over the front of the light. Turn the tool and light clockwise while pushing inward, until you feel the stop point. This indicates the light is properly seated, locked and the electrical conduit, is completely sealed (see page 11). Note: If the light does not turn smoothly, pull the light slightly out and be sure that it’s seated properly and the niche is free of debris, then install the light as described in step 5.
7. Connect the two (2) conductors to the corresponding circuit wires in the Junction Box (black wire to power, white wire to common) and secure the Junction Box cover in place.
8. Final check for proper GloBrite Color light operation: Switch on the main switch or circuit breaker to the 12 VAC transformer and the switch that operates the light itself. The light should illuminate when 12 VAC power is applied. If not recheck the installation steps.
Page 12
Tool mentioned in instructions comes with the o-ring:
O-Ring Replacement Kit Pentair GloBrite OEM 620057
www.poolspaoutpost.com