23 Apr '16, 11pm

What you don’t know about #LED light intensity curves for grow light apps: https://t.co/6TxzcwyZdu

What you don’t know about #LED light intensity curves for grow light apps: https://t.co/6TxzcwyZdu

The light intensity curves for LEDs, regardless of whether they are collimated with a lens or reflectors, follow a bell shaped curve (often referred to as a “Lambertian“ curve). The 50% intensity point for an LED with no optic (bare LED) is virtually always at approximately 120 degrees (60 degrees in each direction). The 50% point (known as the “beam angle” or “viewing angle”) is a lesser number of degrees depending on the collimating specification used. The beam angle is the total angle in both plus and minus directions. What is not commonly known by those not experienced in the physics of LED light emission and optics is that the Lambertian LED light intensity curves can be very misleading in terms of how much light is actually arriving at the receiving end. The emitted light travels in a straight line whose length varies as the angle increases. A beam of LED light trave...

Full article: http://www.edn.com/design/led/4441872/What-you-don-t-know...

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