For indoor use Combo 10W Tube Light with Transformer and Extra 10W Bulb

Submersible Light's Specs: 

• Tube Light is 1-3/4" Length
• 3/4" in Diameter
• 12 Volt Low Voltage
• 10 Watt Bulb can be replaced with a 5 Watt Bulb (comes with a 10W bulb)
• 20' Power Cord
• Extra 10W Bulb FREE!

Transformer's Specs;

• 3-1/4"H ~ 2-1/4"W ~ 2"Deep
• Input: 120VAC  60Hz  30W
• Output: 12VAC  ~ 20VA
• UL Listed
• Class 2
• For use in Dry Locations