LED lighting technology is unlike any other form of conventional lighting we've used in the past as it has unique properties, characteristics and complexities. (The closest equivalent to LED lighting technology is laser.) Unfortunately, the complexity has been widely ignored, and in most cases misunderstood which is why there are so many failed LED retrofits around the world.
Rather than deliver safe, effective and appropriate illumination that significantly improves upon the older lighting it replaces, the LED retrofits have instead caused all sorts of problems.
Not only has the technology itself caused challenges, commonly used metrics for conventional lighting cannot be applied to LED.
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LUMENS VERSUS WATTS
CCT (CORRELATED COLOUR TEMPERATURE) / K (KELVIN)
SPECTRAL POWER DISTRIBUTION (SPD)
The graph picture above is the spectral power distribution or SPD of a 4000 K LED street lighting luminaire.