I have to ask my colleague if he ordered it already. additionally, true DC leds will be more expensive for this project. we have a size of 350 square meters but not every single light is needed to switch/dimm. So the lights are split up in symbolically single virtual zones/groups and each zone should get one channel. so there is e.g. a line of 3 meters x 25 meters with 10 leds. therefore because of the (cable) length it can be difficult to work with NV dc voltage, or all single leds needs their own power supply an and dimmer aktor which gets expensive and I have to ask again for budgetā¦ Iāll let you know
If you can dim these lights with velbus hardware I just want to add that I have been using it for the past 2 years without any issue. Itās not well known as many other but itās open and very stable, plus you can have some automation directly configured in that system + you can add openhab easily to do more sophisticated stuff, while keeping the basic one working even in case of OH failure 
just my 2 cents
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That speaks volumes.
I was only thinking last week that I hadnāt heard from you after you installed your Velbus kit.
(I assumed it was working okay)
@Disa Thanks for pitching in 
Continuing the discussion from Which wired system works best with openhab:
Hi all,
I do have a Velbus system for over 3 years now and I never had an issue with it too. Runs pretty stable and is easy to setup. Integrated with OH you can automized whatever you want. It suits my all my needs and I will continue to implement it further into a future extention of my house. So Iām happy user and I have to say MDAR is really a very, very helpful person! Hope this helps others to make their decisions in a more easy way.
Regard, Jona
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There are already many good answers and I may double it now.
I still would go for KNX. Just because it is an open standard on the wire and we have many manufacturers developing for it. There are few ways to get around the expensive ETS5 software. First, there are the light and the insight version of ETS, which can be enough for most households. With a good group address planning you can manage 100 and more devices via multiple projects with the light version (max 20 per project). The insight does 100 devices. As KNX member you get few times in the year discounts offered for all versions. There are also some manufacturers which offer ETS5 free devices, which configure themselves with a press of a button. Only problem here, you need to sniff for the group addresses, but this is an easy task.
Hope this helps a bit others in the future.
The costs of the ETS software just pays the development of it, not the manufacturers.
Andreas
So this is about the same value you get from an OH binding such as Velbus or ZWave for free.
Thatās the thing about KNX. It hasnāt really evolved but they still want the money like 15 yrs ago when it was sort of unique which it is no longer today.
But they still want to keep hobbyists out of the market, thatās why they charge for the software (which isnāt good as per todayās SW standards)ā¦
Well said Markus
I would say that Wago + Modbus binding is a rock solid solution and one of the cheapest and almost limitless (you can even control SMI shades etc.)
Wago is a PLC, right ? So you need a fully centralized wiring. That now is no challenge if you have that in place, many systems to apply. Just damn expensive to build a house for a controller. It should be the other way round.
yes its a PLC. Well from my experiance YTKSY kable its very cheap to wire it areound the house.
And controller plus modules if you will do it right will be cheaper than fibaro or oher z-wave system and more reliable.
Cheaper than KNX, ok. But cheaper than ZWave which does NOT require ANY rewiring ?
Iām not buying that.
The big problem for me with knx is its price. It is not a very flexible system, and will become even more expensive if you want to expand or change it, once it is in place. Development fees licences and tools is just a pain and makes no sense. It is more or less designed for electricians or knx specialists to make profit.
Waiting for a true open and license free low voltage wired system.
Even if I were to build a house from scratch today I would not put knx in it.
Have you looked at www.velbus.eu
I donāt think youāll ever find a āTruly openā protocol that āeveryoneā adopts, becuase there are too many poeple / companies that want and need to keep control of what happens.
The best we can hope for is a protocol that is freely available, with hardware that is affordable and reliable.
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I havenāt, looks good. I have been involved in some knx installations. Personally I run zwave/zigbee will probably change house in 5 years, not sure what I will invest in. Good thing about zwave is that I can move it, itās expandable and flexible. Doubt I will rewire some house, but who knows.
Regards s
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I meant in house which is under construction. in existing one you are limited to inbox solutions. Which cheapest are shelly.cloud
The cost is in wiring a house. Even when still under construction thatās not for free at all,and later on any change quickly gets expensive if you do the math right.
You wonāt have put conduits/wires where you want them 2 or 5 years later and no, you wouldnāt have engaged and paid the decorator (again) if it hadnāt been for that missing wire.
Let alone that only 2-3% per year are new constructions. So 97% of housing is about retrofitting.
A little less maybe when it comes to smart home tech, but still the vast majority.
Alright. Iām to 95% sure now, that I will make the lightning control with DMX. Also I think, that I will give it a try to dimm 230v GU10 HV LEDs. The reason is, that some lightning lines are to long for one zone to control with only one PSU. Additionally, it will get difficult to position the PSUs.
For other controling like AC or heater etc. itās not yet decided which AC/heater etc. we will get so I will postpone the control things for this.
Donāt, youāll likely regret. Thereās repeaters for this purpose.
Iām going to test with a led and see the results. And what repeater can stop voltage drop without to be a PSU or st least some active thingā¦ E.g in one case I need to pass 25m.
Megad-2561 project works very well in these conditions. With responsive timely support, good price, etc. The only minus of it - its support site is in Russian (tons of documentation and forum threads).
P.$.: Unofficial openhab 1.x/2.x binding is also developed on this forum.