Q1: What is the Warranty for the lamps?

A1: For the lamps,we have 3 years warranty.If any quality problems on our side occured in this period ,we will take on the shipping cost and replacement;

Q2: What is colour temperature?
A2: Zhongda Lighting offer lamps in warm, natural,pure and cool white with colour temperatures measured in Kelvin (K). The lower the colour temperature is, the warmer the light given by the LED:
Warm white = 2700K-3200K
Natural white = 4000K-4500K
Pure white = 5000K-5500K
Cool white = 6000K-6500K

Q3:: What is CRI?
A3: CRI is a figure which feedback the real objects colors.Higher CRI with higher cost.For LED tubes,the CRI is mostly 70-75Ra,and 80Ra with higher cost.But there are some suppliers write a high data to attract clients,please note.

Q4: Will your LED light bulbs work on a dimmer switch?
A4: We do not recommend using our LED light bulbs on a dimmer switch, this type of switch can potentially cause damage to the bulb;
However, you can choose our dimmable bulbs, they are suitable for all kinds of dimmer.

Q5: What is the specific size of the screw base on your Edison base LED bulbs?
A5: The size is E-27/E-26. This size works in all common fixtures.

Q6: Why does my LED light bulb not work properly in extreme temperatures?
A6: Any temperature below 14 F or above 122 F may cause a LED bulb to flicker, dim, change color, or cease to function. Once the LED bulb is returned to an operational environment it should began to work properly.