This MODULAR LIGHT BAR has great advantages comprared with the general light bars in the market, of which includes: 

1.Easy purchase/ distribution :  no need different sizes with different quantities. 

2.Lower stock risks: uniform sizes, just one product in stock.

3.Lower shipping cost:  uniform packing to give smaller volume, no overlength cost.  

4.Can replace bulbs / Easy after-sales service: if some LEDs are broken like the general bars, just replace the broken unit.