Caution Do not Float

After less than 4 weeks in the pond are 2 out of 5 lamps "dropped out". The inner workings totally corroded because water was in the complete lamp. According to sellers, we are the first ones to have problems with the tightness. We were offered a service error - lights not properly screwed down - regulated. For over 6 years we have had identical lamps in the pond and never had problems with it. The friendly offer anyway to send us 2 spare bulbs, has still not been implemented after 12 days.
Recommendation - not got