42 43 of outer compartments 31 32 is coated with a reflective material to enhance the light reflection from lamp 21 through the water the specific number and location of the compartments in the compartment means of the present invention is not critical and may vary widely for example a single compartment can be used for housing the weights and a single compartment for housing the power assembly means similarly more than two compartments can be used for housing each of the weights and power assembly means likewise the specific shape of the compartment means is not critical as long as it conforms to the shape of the shell means so that it can be inserted within the shell means the compartment means can be made of any rigid plastic or synthetic material compartment assembly 30 further includes a rigid plastic plate 50 lamp socket 20 is attached to and supported from this rigid plate 50 preferably the upper surface 51 of rigid plate 50 is coated with a reflective material to enhance the light reflection from lamp 21 through the water rigid plate 50 has dovetailed ends 52 53 dovetailed ends 52 53 engage the dovetailed lips 40 41 thus detachably securing lamp socket 20 in place above and in compartment 33 rigid plate 50 can thus be removed for installation testing or replacement of the power assembly means in compartments 36 37 which means will be described shortly rigid plate.