If you have quoted Watt Seconds, you then need to know the efficiency in terms of the number of Lumens per Watt Second the unit produces. You can then calculate the Lumenseconds value to compare the units.
Your cousin considered 1/4 blood relation to you marries and the child is considered 1/8 blood relation to you. A sibling is full blood, niece/nephew is 1/2, cousin 1/4, cousins baby 1/8 and so on. If it is your first cousin's wife's baby then it is your first cousin once removed.
Your parent's first cousin is your first cousin once removed. The child of your first cousin is also your first cousin once removed: your grandparent is that child's great-grandparent. You can do the whole removed thing for every category of cousins -- second cousin once removed, and so on.