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Loosen the two screws on the lamp holder with
a 3mm Allen key.
Lift up the air outlet part a little, and then push
back the air outlet part by squeezing the flexible
tube together.
When the flexible tube is squeezed, the lamp
with its holder is laid open.
Gently pull the lamp out of the fit it is sitting in.
Unplug the lamp and replace it by the new
lamp. You may plug in the lamp either way,
polarity does not matter.