Meanwell 48V Transformer

Choosing the right transformer
V = Voltage, W = Wattage.

Voltage
Select a corresponding voltage to the magnetic modules.
Since Near magnetic LED modules are 48V, select a 48V transformer.

Wattage
The magnetic LED modules come in different wattages. To know which wattage to choose, simply add the wattages of the different modules together.

Example: If you are installing 5x 18W Linear flood module, 3 x 9W Cylinder Pendant module, 1x 9W Tracklight module. 

Total Wattage: (5 x 18W) + (3 x 9W) + (1 x 9W) = 126W 
Pick a transformer that is has 15% more power capacity to ensure the longevity of the lighting modules: 126 x 1.15 = 144.9W. Since there are no 144.9W transformers, you can opt for the 150W transformer.