ALL Lights comes with a weatherproof transformer (see below on this page) and have a power cord length of 31 feet.
6-LED Light: $22.95
6 Watt, Power Consumption <1.5W
6 LED Light has a 1-1/8" outside diameter.
Inside opening diameter: 1/2" Yes a 1/2" OD tubing will fit snugly in this hole.
12 LED Light: $32.95
12 Watt, Power Consumption <1.5W
12 LED Light has a 1-1/4" outside diameter
Inside opening diameter: 5/8" Yes a 5/8" OD tubing will fit snugly in this hole
For 6 & 12 LED Lights Transformers
Electrical Specs: AC-DC Adapter
Input 120V ~ 60Hz ~ Output: 12.0V ~~ 100ma
Electrical cord length from light to connection to transformer. 31'
24 LED Light: $39.95
24 Watt, Power Consumption < 2W
24 LED Light has a 2-1/2" outside diameter
Inside opening diameter is 1-1/2"
24 LED Light Electrical Specs Transformer
Input: 120VAC ~ 60Hz ~ 10VA
output: 12VAC ~ 0.5A ~ 6VA
Light's cord to connection: 31'
Watertight transformer.
Each Light comes with this transformer and this is how it connects to the transformer, 2-pin connection. 
