Remote controller - TALE series

Do I need a remote for each light I purchase or can one remote be programmed for 2 lights?

It depends. As long as the lights are in one area, one remote controller can control them but you need to walk around with it to control if there are many lights.

I have a 40x40 shop with a 15 foot ceiling and I have 12 hyperlite tale series 150w installed. If I buy the motion sensors for each light and the remote control would I still need the dimmer switch to dim my lights down.

No, you will not need the dimmer switch. You can dim the lights through the motion sensors using the remote controller for Tale Series.

does this control the 150w high bay lights directly? Or do I need the low voltage dimmer switch you provide to operate them, and how many lights will the remote control?

You will need the dimmer to operate them.
It depends. As long as the lights are in one area, one remote controller can control them but you need to walk around with it to control if there are many lights.

What does the Stand-by dimming mean? What does it do? Why would you need it?

Stand-by Dim means, the Level of dimming if using this function while a motion sensor controls the on and off function. The dimming level for the fixture can be configurtated to provide 10%, 20%, 30% or 50% illumination. Note: Motion sensor setting and dimming setting please refer to remote control.