1, Warranty time:
----this means potential cost for failure lights in future.
2, LED Chips Brand:
----Compared to LEDs made in China Mainland, cost of LEDs from CREE, Samsung, Seoul, Epistar, Bridgelux etc will have much higher cost.
3, Driver:
----CNC only use drivers from professional driver manufacturer, it cost much higher than many other suppliers who is using drivers by their own.
4, Real lamp power:
----When CNC is saying 10Watt, it is often 12 Watt, but some competitors are saying10Watt for a lamp that have only 7Watt. It is certainly that our 12Watt will cost much higher than 7Watt.
5, Packing method:
----A good packing will cost much higher than an awful packing.