2. Sprite Lamp is an amazing tool that takes 2-5 hand painted lighting profiles and combines them to a normal map.
This way, you could have things like brush strokes in the normal map and you can achieve a better quality if you take the time (and have the skill) to paint everything nicely.
Sprite DLight is targeted to projects with larger numbers of sprites, where you just don't have the time to draw everything by hand.
Think of animated characters. You would just process the sprite sheet in one click, resulting in quick normal maps that are all calculated with the same settings.
So Sprite Lamp is about maximum control and making your work easier, while Sprite DLight is about doing your work for you.
If you do not know which one to choose, just take both
![Wink ;)](./images/smilies/ms-wink.png)