Ciaran,
You need to measure light output in lumens to compare the efficacy of the
Led light output to a 100W bulb. This is not the same as efficiency.
You unit pulls 400mA at 230v which means it pulls
230 × 0.4 = 98W
Making it a whole 2 watts more efficient! Well done!!!
On a more positive and less sarcastic note it should throw better light
over a larger area and be dimmable, the leds should last longer than a bulb
and in my opinion are cool!
Cheers
Alex
As an update, thank you all for your help. The delivery came and it was
exactly (well almost exactly, waterproof version rather than sticky-backed
came) what I was looking for.
Using one of these:
http://www.maplin.co.uk/plug-in-mains-power-and-energy-monitor-38343 I
measured a current of 0.01A when it was ‘off’ from the remote control, and
in ‘full bright, white light’ which I figure to be the worst case it was
pulling 0.4A.
I guess? that means the fully bright version is roughly equivalent to using
a 100W light bulb?
Is the ‘off’ 2.4W worth worrying about …and excuse my lack of knowledge
again but presumably thats 2.4Joules/s, so to work out how much that costs
can I just do: ( 2.4 / 3600000 ) * <price_per_kWH> ?
Or is it all random and I stand no chance of understanding 
-cj.On Thu, Feb 21, 2013 at 7:49 AM, Ciaran ciaranj@gmail.com wrote:
On Wed, Feb 20, 2013 at 9:58 PM, Dave Painter dave.painter@gmail.comwrote:
To mention that the product shown in the link :-
http://www.ledhut.co.uk/led-strip-lights/5-meter-smd-led-strip-light-60-led-s-per-meter-warm-white-best-price-on-the-internet.html
Appears to be the newer version of this light tape and has twice as
many LEDs as previous one, which is why it might seem that there’s cheaper
versions on eBay. Depends if you’re buying on price or spec.
In the end I purchased this one:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170909849104&var=470200142120which I think has the same number of LEDs (300 in 5M or 60/M) so it looks
to be very similar, however I cannot really tell these things apart!
I’m definitely buying on price atm for this project, I lack the depth of
knowledge to be doing it on spec !
Thank you !
On Wednesday, 20 February 2013 10:14:00 UTC, JavaJunky wrote:
On Wed, Feb 20, 2013 at 10:09 AM, Ian Norton i.d.n...@gmail.com wrote:
On 20 February 2013 10:07, Ciaran cia...@gmail.com wrote:
Hmm, yes thats exactly what I’m looking for! Out of interest do you
happen
to know if there is much draw from leaving the transformer/driver on
’all
the time’ ?
Alex answered this one:
If the controller is completely off as in there is an isolating
switch on the PSU then the device will draw no power. If the controller is
merely no lighting LEDS it is still on and will draw a small amount of
power. Not shedloads I suspect but some…similar to the power LED on
your TV or sound system.
I’d agree with that. It would very much depend on what power supply
you use as to how much current it draws whilst idle.
Indeed Alex did answer it, from a theoretical perspective but I was
hoping you knew from your experience of the strip + controller combination
you purchased 
But it seems it is a classic YMMV type issue!
Thank you both for your help!
-cj
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