Differences between covalent and dative bond

The key difference between covalent bond and dative bond is that covalent bond forms when unpaired election of two atoms associate with each other while the dative bond forms when an atom donates one of its electron pairs to another atom

Explanation:

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.