Welcome to the forum!
Those pics are so big, I kind of get lost scrolling around to view them.
Looks like a 12v 300w T-3 halogen bulb would be what you want. You've got a transformer to take it down to 12 volts (10: 1 step down transformer). If you didn't have the transformer, Ace hardware (the couple near me) carry the 120v bulbs for ~ 1/2 of what a pool store sells them![]()
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