I am having problems with my pool Pentair Amerlight 500 watt pool lights. There are two of them wired as shown in the attached diagrams. The first shows the original wiring with separate 15 AMP circuit breaker connected to the LINE lugs of a Leviton 20 AMP GFCI outlet and the pool light circuit connected to the LOAD lugs. In December the North pool light failed and the GFCI would trip when either dimmer switch was brought to full. After reading the forms I replaced the North light with a new gasket, replaced the dimmer switches, checked all wiring connections and tried new GFCI outlets and dedicated GFCI 15 AMP circuit breakers. While detail is shown in the attached, the end result is that both lights will function normally when individually brought to full light, but will normally go only to 50% together until the GFCI trips on the GFCI Circuit breaker. Repeated attempts allows both lights to be brought to full intensity together, but several hour later they may initially be brought only to 50% again until the GFCI trips. Would appreciate any advice on where my problem could be.