RE: CBus dimmale LED's

[Paul Gale <groups2@xxxxxxxxxxxxxxxx>]

I just got 4 of the Megaman 6W LED GU10's
(LR1206dDGv2-WFL-GU10-2800-25000) in warm white.

They do work OK with my CBus leading edge dimmers. There is some slight
flicker or jumping in level when they're being dimmed up to full - like the
last step to full brightness jumps a little. I did find that the only GU10
fixture I have doesn't hold the GU10 fixing very well, it's a little loose
resulting in the lamp not making contact when it's fully inserted. Probably
my fixture rather than the lamp though.

I found the warm white still quite blue compared to the halogen 50W -
definitely not as nice of an effect, a little bit stark, so not sure these
will be exactly right for me - but at least they do work! The LED lamps and
first inspection seem to give off a more directional light compared to the
more diffuse halogens I had, resulting in a more pronounced shadow. I'll do
some more testing though.

I'm going to get some GU10 connecting blocks and wire tails to convert a
few existing downlights and see how they look.

Hope that helps anyone else with CBus looking for LED GU10's

Paul.

-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of Paul
Gale
Sent: 10 December 2012 12:56
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] CBus dimmale LED's

Yes good thoughts.

I'll explore the costs of the megaman further. I did look at the starburst
lamps but they're pretty expensive.

Paul.


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of Neil
Ball
Sent: 10 December 2012 12:47
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] CBus dimmale LED's

The Megaman units are 230v GU10 lamps, not MR16 low voltage.



I decided to replace my 12v MR16 fittings as I was not confident that my
existing 20-60VA 12v Aurora transformers would be happy running an LED
load, therefore I would most likely have to buy and fit replacement
transformers to keep my fittings 12v. It was also more difficult to find
good quality dimmable 12v LED lamps, and those I did were nearly twice the
price of the
GU10 Megaman lamps. I did briefly consider replacing the 12v MR16 lamp
holder with a 230v GU10 lampholder to convert the fitting to 230v, but in
the end as my original fittings were just basic Aurora cast downlights I
decided to replace the entire fitting with a slightly more attractive 230v
downlight from a different manufacturer.



Neil B.







From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of Paul
Gale
Sent: 10 December 2012 12:36
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] CBus dimmale LED's





I'm a bit confused now - do the dimming MR16's still need an LED driver or
will they work from an existing transformer?

I have old wire wound transformers that supply around 6 50W halogens each.

Is there a solution that allows just a replacement lamp (I guess with a
built in driver of some sort)? Or does the transformer definitely need
replacing? (the transformer replacement would mean taking down the ceiling
and fitting a new one - although that might have to happen anyway with the
changes to plumbing).

Cheers,

Paul.

-----Original Message-----
From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
] On Behalf Of Paul Gale
Sent: 10 December 2012 12:22
To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
Subject: RE: [ukha_d] CBus dimmale LED's

OK cool - where did you get your megaman units from?

No sign of flickering at dimmed levels?

Paul.

-----Original Message-----
From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
] On Behalf Of Neil Ball
Sent: 10 December 2012 11:45
To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
Subject: RE: [ukha_d] CBus dimmale LED's

Hi Paul

My dimmers are universal in as much as I can set them to trailing or
leading edge depending on the attached load. The Megaman dimmable LEDs
specify leading edge dimmers so should be fine with your CBus units,
subject to minimum loading etc.

Neil B.

From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
] On Behalf Of Paul Gale
Sent: 10 December 2012 11:01
To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
Subject: RE: [ukha_d] CBus dimmale LED's

Thanks Neil.

Are your dimmers leading or trailing edge?

Mine are the older leading edge although I see that there's a 'universal'
CBus dimmer that does both leading and trailing edge from what I can see -
wondering if that needs to be changed?

Paul.
-----Original Message-----
From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
 <mailto:ukha_d%40yahoogroups.com>
] On Behalf Of Neil Ball
Sent: 10 December 2012 10:54
To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
Subject: RE: [ukha_d] CBus dimmale LED's

I use Helvar dimmers rather than CBus, but I've had good results with the
new Megaman 6W Dimmable lamps which were good value from Starlec online.
They dim nicely and are a nice warm white. I've also tried some Megaman
golf ball dimmable LEDS in table lamps which also work well. However I've
found that unlike the GU10 lamps, these do not go fully out when
"off" - I get a very dim output that is only visible in a truly
dark room (whereas the GU10s go fully off). I'm guessing the driver
electronics in the base of the lamp are different and this combined with
the electronic dimmer (as opposed to a wall-mount dimmer with a physical
switch operation) is causing the issue.

Neil B.

From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
[mailto:ukha_d@xxxxxxx
<mailto:ukha_d%40yahoogroups.com>
 <mailto:ukha_d%40yahoogroups.com>
] On Behalf Of Paul Gale
Sent: 10 December 2012 10:42
To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<mailto:ukha_d%40yahoogroups.com>
Subject: [ukha_d] CBus dimmale LED's

Has anyone here in the UK got CBus with leading edge dimmers and had really
good experiences of dimmable LED driver/lamps? I've seen a number of posts
on the CBus forums but they seem to mostly relate to Australian
parts/suppliers etc.

I'm re-modelling my kitchen and want good output, dimmable LED's for the
downlights. Limited budget though, so they can't cost a small fortune.

Any ideas/experiences?

Many thanks,

Paul.

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