Underwater swimming pool illumination systems

For use in underwater swimming pool illumination, an underwater lighting assembly comprising:

• a waterproof lamp enclosure having a generally bowl-shaped body portion adapted to receive the rear portion of a conically-shaped lamp unit, an O-ring seat formed around the outer part of said body portion and a compressible O-ring fitted in said O-ring seat, retainer means to fit over the outer part of said lamp unit, a flange formed around the outer part of said bowl-shaped body portion, and fastener means associated with said flange and said retainer means to cause the rear portion of said lamp unit to be forced against said compressible O-ring when said fastener means are tightened;
• electrical wires attached to said lamp unit and passing rearwardly from said body portion, and means for exteriorally waterproofing the rear of said body portion;
• and a low-voltage battery connected so as to provide low voltage, ripple-free direct current power to said lamp unit;
• said low-voltage battery and a battery charging circuit being each remotely situated from said waterproof lamp enclosure, said battery being connected to the first and second switch elements of a double-pole, double-throw switch;
• said electrical wires from said lamp being connected to first contact elements of the first and second poles of said double-pole, double-throw switch;
• and the output of said battery charging circuit being connected to second contact elements of the first and second poles of said double-pole, double-throw switch;
• so that when said switch is in its first pole position, said battery is electrically connected to said lamp and not to said battery charging circuit;
• and when said switch is in its second pole position, said battery is electrically connected to said battery charging circuit and not to said lamp.