Monthly Archives: October 2020

The New Citizen Generation 8.5: Maximize the LES lumen output

Two weeks ago we launched the new product, aLED SUVISPOT, which is all about the greatest color rendering there is. However, sometimes the application doesn’t need great color rendering. We are now talking about industrial lighting and some outdoor lighting like in the sports fields. In these cases, the lumen output is more important than color rendering.

In this blog post, I’ll tell you about a new product from Citizen which is the answer to all high lumen output needs. It’s Citizen generation 8.5.

Citizen generation 8.5 has two main features. First, you can drive it with 300mA per diode, which is 120mA higher than in basic generation 8. Second, it has higher efficacy than in generation 6. These two features combined give you the opportunity to maximize the lumen output of the LES. Let’s get more into that.

Features of the new 8.5 Generation COB LEDs

  • Ra70min 
  • MacAdam 3step
  • 5% better lumen efficacy than in generation 6
  • Higher maximum driving current – 300mA
  • Available in all regular Citizen COB sizes
  • Up to 82 000 lumens
  • Great compatibility with aLED ALOG100 glass lenses
    • Angles from 20° to 160° and street light lens 140°x70°

Maximizing the lumen output of the LES

All Citizen COB LEDs has four different LES sizes. Because the LES size affects how optics work, LES sizes are often one of the principals of the technical luminaire design. Here we will give you some examples of how Citizen generation 8.5 LEDs can be used. In addition, we will tell you the maximum lumen output of each LES size. Because our aLED ALOG100 glass lens series goes so well with these LEDs we will use them too in the examples.

What is LES? – LES comes from the words Light-emitting surface.
In the nutshell, it means the size of the light area.

Maximum lumen output examples

The next examples are all generated with a simulator. Note that, actual values may differ by the application. All examples use the same aLED ALOG100 borosilicate glass lens (ALOG100-045). In the lux values, the optic’s efficiency has been noted.

Ø9,7mm – 5 758 lumens

This first example is something that I think is really interesting. Here is the smallest COB LED which LES diameter is only 9,7mm. From this tiny LED you can get almost 6000 lumens. This is 1300 lumens more than with generation 6 equivalent products. 

In other words, with this LED you can make luminaires with high lumen output and a very narrow beam angle.

Ø14,5mm – 14 429 lumens

As I said before LES size affects the light distribution. Here we use the same ALOG100-045 glass lens as in the previous example. However, the LES size is now 14,5mm, so the light beam angle expands to 30 degrees. This means that even though we have now three times more lumens, the lux values stay almost the same. But note that the diameter of the light beam (@14 meters) is now 1,5 times bigger.

Also, with this LED you can get over 3000 lumens more than with generation 6 equivalent product.

Ø22,0mm – 38 370 lumens

In this example we are getting 38 370 lumens from LES size 22mm. This is over 8000 lumens more than with generation 6 equivalent product.

This solution gives you tremendous amount of light to very wide area.

Ø32,8mm – 77 204 lumens

This last example is something extreme. Here we are getting the highest lumen output on this series. With the biggest COB LED (LES Ø32,8mm) you can get 77 2004 lumens with 612W. Which is over 16 000 lumens more than with generation 6 equivalent product.

Where to use Citizen Generation 8.5 COB LEDs?

Now that we have gone through some examples, and maybe you have already invented a couple of uses for the LED yourself, I will tell you application ideas for the new generation LEDs.

As this series’ color rendering index is only Ra70, it is not meant for places where you want to make the colors pop. That is because generation 8.5 COB LEDs are great for industrial use, where you need a lot of light and the height of luminaire can be really high. Warehouses, airports, and sawmills are great places to use these LEDs.

Also, when you need a lot of light and a narrow light beam angle, you should note this generation. 20° light beam and 5700 lumens is a really tough duo.

Do you want to know more about Citizen generation 8.5 products? Contact our sales team by email info@light.fi and they will tell you everything you want to know about these new products. If you have any comments about this blog post, feel free to comment down below.

Download a brochure about Citizen generation 8.5 below.

Download Here