Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.



1968 posts

Uber Geek
+1 received by user: 98

Trusted
Subscriber

Topic # 109687 25-Sep-2012 10:47 Send private message

Hey folks,

I have recently done a bit of a project and put in some outdoor lights. All the cable is laid and I am running three halogen 50 watt MR16's on one cable from a 200 W 12 V AC Transformer.

It all runs fine but I am wanting to run some LED strip lighting (which I already have) on the same circuit. The problem arises from the fact that the LED strip lighting doesn't like the 12 V AC.

So, I need to find a driver that can run 3 x 5 Watt LED lights (I will swap the halogens out for LED's) and a 5 metre LED strip. I am having trouble finding something that is an LED driver but can run all this stuff off one circuit. The other thought I had was trying to convert the existing 12V AC to 12V DC. There doesn't seem to be anything around to do that.

Any ideas?

Thanks, Matt.




Nexus 5, Galaxy Tab S, HP Ultrabook, Mysky HDi, 2talk, Pebble Steel

Create new topic
2020 posts

Uber Geek
+1 received by user: 331

Subscriber

  Reply # 691267 25-Sep-2012 17:58 Send private message

Have you been to an electrical wholesaler? This is something they will have on the shelf. Stewarts/Radcliffe's is my first choice but otherwise there is Ideal, Corys and some Mastertrades.

2890 posts

Uber Geek
+1 received by user: 33

Trusted

  Reply # 691329 25-Sep-2012 19:58 Send private message

LEDs should require only a regulated 12V DC, not an constant current driver (unless you are making an LED fitting yourself). Where are you putting the transformer?




You can never have enough Volvos!




1968 posts

Uber Geek
+1 received by user: 98

Trusted
Subscriber

  Reply # 691368 25-Sep-2012 21:25 Send private message

Thanks for the replies guys. The transformer is in a garden shed and is on a relay. There is a run of abut 20 metres of 2.5 mm 12 volt cable. I haven't checked out the wholesaler yet but have been buying stuff from JA Russell.

The three halogens are Mr 16's and I have a bodgy led mr16 from DX.com to try when I find a suitable transformer. I found a transformer at surplustronics Surplustronics

I will whip down to JA Russell and see what they have to say....j




Nexus 5, Galaxy Tab S, HP Ultrabook, Mysky HDi, 2talk, Pebble Steel

2890 posts

Uber Geek
+1 received by user: 33

Trusted

  Reply # 691812 26-Sep-2012 17:15 Send private message

Looks like you need only about 20W, but going for an IP rated transformer is the right thing to do for a shed. A 60W transformer will be more than enough, also for future proofing.




You can never have enough Volvos!




1968 posts

Uber Geek
+1 received by user: 98

Trusted
Subscriber

  Reply # 691815 26-Sep-2012 17:22 Send private message

I think the 5 metres of LED is about 25 Watts, plus 3 x 5 W for the LED spots so the 60 Watt transformer should do the trick nicely. The guys at JA Russell looked at me blankly and said they would have to "get something in". They said "We have 12 Volt AC transformers if you want one of those". They are stuck in last decade methinks.




Nexus 5, Galaxy Tab S, HP Ultrabook, Mysky HDi, 2talk, Pebble Steel

11106 posts

Uber Geek
+1 received by user: 530

Trusted
Subscriber

  Reply # 692312 27-Sep-2012 15:16 Send private message

LED world had something that was like a transfromer but a switchmode protected legit approved 12v power supply.

Problem is dimming has to be done after the power supply with a PWM dimmer so useless if you already have a nicely automated phase controlled dimming system.

I am suprised there is no LED driver that will take in a phase control dimmed AC feed and output a PWM'ed 12v DC output. Would have thought there would be demand for that.




Richard rich.ms

Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





Trending now »

Hot discussions in our forums right now:

American legal jurisdiction in New Zealand
Created by ajobbins, last reply by ajobbins on 20-Oct-2014 22:53 (22 replies)
Pages... 2


Another Trade Me competitor: SellShed
Created by freitasm, last reply by mattwnz on 20-Oct-2014 15:16 (22 replies)
Pages... 2


Why would Suresignal calls be worse quality than non-Suresignal calls from the same location?
Created by Geektastic, last reply by froob on 21-Oct-2014 08:21 (41 replies)
Pages... 2 3


Picture resizing on the forum
Created by Jase2985, last reply by freitasm on 18-Oct-2014 13:32 (13 replies)

Internet question...
Created by Geektastic, last reply by Geektastic on 17-Oct-2014 22:59 (40 replies)
Pages... 2 3


Why do people keep thinking National are doing a great job?
Created by sxz, last reply by Geektastic on 20-Oct-2014 23:05 (156 replies)
Pages... 9 10 11


Just bought a TiVo online. No wireless adaptor. Will a standard one work? Or do I need the TiVo one ?
Created by Limerick, last reply by graemeh on 20-Oct-2014 16:03 (11 replies)

Lollipop it is then. Android 5 announced with Nexus 6 and 9
Created by Dingbatt, last reply by kiwifidget on 21-Oct-2014 09:16 (57 replies)
Pages... 2 3 4



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.