DIY Forum

 

Ultimate Handyman Ultimate Handyman Ultimate Handyman Ultimate HandymanUltimate Handyman on Pinterest

 

DIY Forum/Home improvement advice forum

 

 

A-Z CONTENTS | DISCLAIMER | DIY VIDEO | HOME | SAFETY FIRST | FORUM RULES

It is currently Tue Dec 12, 2017 5:44 pm
Visit Thermo worx


Time zone: Europe/London




 

 


Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Sun Dec 22, 2013 7:53 pm 
Offline
Troll Headbutter
User avatar

Joined: Sat Jan 01, 2011 8:20 pm
Posts: 8052
Location: On top of a mountain, in the long grass.
Has thanked: 554 times
Been thanked: 1041 times
If you've got some cheap LED bulbs similar to this, hope it's of use - I'm a sucker for a bargain, but some of the recent lights I've seen have made me think twice about where and how much I pay for them!



Saw this and thought I'd share in case it helps anyone. I can honestly say I've NEVER turned a circuit off to change a bulb and perhaps I will in the future - stay safe!

BG

_________________
Arguing with a woman is like reading a Software Licence Agreement.
In the end, you ignore everything and click "I agree".


Share on FacebookShare on TwitterShare on DiggShare on DeliciousShare on Google+
Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 8:04 pm 
Online
Senior Member
User avatar

Joined: Sat Jan 10, 2009 3:49 pm
Posts: 22586
Location: hants/dorset border
Has thanked: 1348 times
Been thanked: 3461 times
:shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock:

_________________
Verwood Handyman

Verwood Handyman


___________________________________________________________________

If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

http://www.donnasdreamhouse.co.uk/


Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 8:33 pm 
Offline
Senior Member
User avatar

Joined: Mon Mar 15, 2010 11:49 pm
Posts: 9494
Location: Oban
Has thanked: 327 times
Been thanked: 1676 times
Should we be surprised? Given the price they sell them at there just HAS to be a compromise in there somewhere - even a lethal one so it seems! :shock:

I suspect the only difference between the cheap chinese knockoff and 'legit' LEDs would be some insulation between that PCB and the outside world. The voltage dropping circuit is pretty much de-rigur for the device.

_________________
sent from my laptop using my fingers - because we REALLY need to know where it's come from.....


Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 9:30 pm 
Offline
Pro Carpenter
User avatar

Joined: Sat Dec 16, 2006 10:11 pm
Posts: 19666
Location: redhill surrey an auld reekie laddie
Has thanked: 636 times
Been thanked: 1798 times
as an aside

is there any difference in efficiency between a led bulb rated at say 85-240v over a 220-240v or does it depend :dunno:

_________________
we are all ------------------still learning


Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 9:55 pm 
Offline
Senior Member
User avatar

Joined: Mon Mar 15, 2010 11:49 pm
Posts: 9494
Location: Oban
Has thanked: 327 times
Been thanked: 1676 times
If the LED is built using the capacitor-dropper method then the components should be calculated to run the LEDs at their rated current at the maximum operating voltage. At lower voltages the LEDs will be under-running thus 'saving power' but at the expense of light output - although you'd probably be hard pressed to notice the difference by eye alone.

_________________
sent from my laptop using my fingers - because we REALLY need to know where it's come from.....


Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 9:58 pm 
Offline
Pro Carpenter
User avatar

Joined: Sat Dec 16, 2006 10:11 pm
Posts: 19666
Location: redhill surrey an auld reekie laddie
Has thanked: 636 times
Been thanked: 1798 times
ok cheers so at uk mains makes little difference consumption and output wise :dunno:

_________________
we are all ------------------still learning


Top
 Profile  
Reply with quote  
PostPosted: Sun Dec 22, 2013 10:02 pm 
Offline
Senior Member
User avatar

Joined: Mon Mar 15, 2010 11:49 pm
Posts: 9494
Location: Oban
Has thanked: 327 times
Been thanked: 1676 times
One would HOPE that they were designed such that max light output was for our local voltage - if they designed it for the LOWER voltages then running it at 240V would be OVER RUNNING them.

Like I said, designing them for the higher (i.e. our) voltage only means a very slight reduction in brilliance when running at say 110V.

There should be no difference in operation between the LEDs marked 85-240 and ones marked 240V only assuming they were both running at 240V

_________________
sent from my laptop using my fingers - because we REALLY need to know where it's come from.....


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 


Similar topics
   

Time zone: Europe/London


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Visit Hilti


 

 

 

News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy

Contact

 

Powered by phpBB® Forum Software © phpBB Group

phpBB SEO