Optical Fresnel Lens Long Shot Flashlight Condenser Parallel Spot Straight Light Lens

How to choose the correct focal length of the Fresnel lens used on the lamp?
1.The distance from the lamp bead to the lens position is called the object distance.
2. The object distance is not equal to the focal length of the selected lens
3. The focal length is appropriate, the light output angle is the smallest, 
and the light output angle will increase if the focal length is larger or smaller
4. According to experience, generally choose the lens whose focal length is equal to or greater than the object distance for testing.
5. Or you can contact us directly, we will help you find the correct focal length lens.

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2. Items will be shipped within 1-10 business days on payment received.
3. Delivery time depends on destination and other factors, it may takes up to 20 business days.

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