Can I use LED lighting sources to illuminate my workbench and desk?
Your question is a little broad, but I will interpret it to be something like "Can I use LED lighting sources to illuminate my workbench and desk?"

Yes. While the purchase price of LEDs is still much higher than conventional bulbs or CFLs, the prices are dropping and you often can find sales. There are 75 watt led flood bulbs now available in the $20 range, such as these



They can be used in simple porcelain or plastic lamp sockets in a basement, garage or workroom. 

There are also LED retrofit trim baffles for recessed lighting, in the 65+ watt range, such as these



They are often on sale for less than $30.

GU10 units are also available, but they tend to be in lower wattages.

All of the above are designed for 110-120 volt systems.