[Gii]

il problema principale nell'acquistare i led online è questo:
"The specifications of many reef LED fixtures available today list the brands and types of LEDs used (such as Cree XT-E or Philips Luxeon Rebel). Yet, most manufacturers do not specify, the particular LED bins which they used in their fixture. Still, bins are a very important characteristic which we need to keep in mind when building a LED fixture.

What is a bin? Due to technological reasons, the parameters of LEDs can be different even within the same batch. To achieve a product with uniform quality, leading LED makers sort out their product into several categories, depending on certain characteristics, which they call bins. Color bins contain LEDs with similar wavelengths, or spectrum; luminosity; whereas, efficiency bins consist of LEDs that are sorted out according to the efficiency of converting the electric energy into light. Each manufacturer assigns certain bin codes to these LEDs, and this bin code is attached to LED model number in order to better characterize the properties of the lot that is offered for sale.

If we look at the offered color bins, for example, we can see that emitters with different prevailing wavelengths are available for the same LED type. For example, consider the newest generation of Philips Luxeon Rebel ES Royal Blue emitters (Fig 1):" citando l'articolo del link precenete!