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PostPosted: Fri Mar 22, 2024 12:04 am 
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As you probably all know, LED has been the dominant light source in street lighting for more than several years now, and has rendered practically every other light source redundant, including the likes of SON, Cosmo, and CFL. Therefore, I am wondering what will replace LED, and when we will likely see this change. Will LED lanterns also be missed and even sought after collectors in the future? Only time will tell…


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PostPosted: Fri Mar 22, 2024 7:08 am 
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I am not convinced anything will in our lifetimes.

LEDs were invented in the 1960s, and it took over 30 years before a full spectrum of colours was able to hit the market and a decade after that before it started being a viable replacement as anything other than a decorative or signalling light source. With other light sources too, it has generally taken some time from invention to commercial success, with some much faster than others. Generally, light sources don't get invented and overnight become a big thing.

So, what light sources are in the early stages of development, where people are investing and experimenting into them? To better LED technology, it would need to be cheaper to produce and have higher efficacy. At present, LED technology is still being invested in heavily, and that is where commercial efforts are focussed. At present, the only technologies that may theoretically have a chance of beating traditional LEDs are LED-related technologies like OLED and laser diodes, but that's almost like comparing a tungsten filament with a carbon filament when they're both incandescent bulbs.


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PostPosted: Fri Mar 22, 2024 8:22 am 
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LEDs are also a solid-state technology which allows them to be customised and optimised a lot more than conventional lighting. This is why standardisation is probably never going to happen with LEDs. LEDs have easily surpassed the 200lm/w of SOX. They can also produce almost any colour (although some aren't very efficient compared to white LEDs). They can also be dimmed easily. So I don't think anything will replace LEDs for at least a few decades, and definitely not a discharge lamp.


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PostPosted: Fri Mar 22, 2024 9:59 am 
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Interesting. I’m quite curious if manufacturers will start designing lanterns that make use of the Philips TrueForce LED lamps? In my opinion, they’d look more aesthetically pleasing than “flat panel” LED lanterns.


Last edited by TB79 on Sat Mar 23, 2024 1:08 pm, edited 1 time in total.

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PostPosted: Fri Mar 22, 2024 3:44 pm 
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An optimised LED fixture is one that distributes the light effectively from source, essentially an LED shining through a refractor to get the beam where it is wanted straight from where light is generated. This is why purpose designed efficient LED fixtures are designed as integrated units. Designing a fixture like a HID fixture in which you fit a "bulb" is not as efficient, because you're also producing light in directions from the light source that is not needed, such as directly upwards towards the canopy, or vertically down to the road. So, the answer is no. Even if there is a desire for replacing LEDs, it would be more efficient to design an LED array that can be swapped out as opposed to trying to mimic a discharge lamp.


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PostPosted: Fri Mar 22, 2024 4:16 pm 
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TB79 wrote:
Interesting. I wonder if manufacturers will start designing lanterns that make use of the Philips TrueForce LED lamps?

The TrueForce LED lamps are already optimised for discharge lamp reflectors. And while you could probably improve the reflectors slightly, they would still be nowhere near as efficient as dedicated LED arrays. And so why would you buy a new fixture if you could just retrofit the old ones and get a similar performance? And for all the manufacturers other than Philips, why optimise a fixture for another manufacturers lamp?


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PostPosted: Sat Mar 23, 2024 8:32 am 
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Refractors/reflectors were used to overcome the deficiencies caused by discharge lamps - they aren't point sources of light, so beam control was poor. SOX and SLI were very efficient but the optical performance was poor. SON was less efficient although by the end it was comparable with SOX but the optical performance was better.

LEDs are in effect point sources, so the optical performance in terms of beam forming is almost ideal to the theoretical and the light comes out in one direction. The one optical disadvantage of LEDs is their small viewing angle, but this can easily be improved with a small lens. This method allows the use of a smaller number of more powerful LEDs, rather than adding more LEDs to a multi-angle array.

The Trueforce is just an attempt to use a LED lamp in an old discharge fitting. Not very efficient either optically or practically. The discharge fitting is going to be 5/10/20/30 years old anyway so it's better to replace it as old lanterns suffer from broken parts, loss of weather sealing, will need testing for electrical safety etc etc.

Trueforce is a technology dead end, it is the usual sort of thing Philips does to achieve sales. Those lamps won't be around in 10 years time and probably not in 5.


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