Latest Thinking About LED Lamps

[securespark]

Hi guys

Upgrading my lounge led lamps as they pop off.

GU10's currently 4.5w cool white.

Looking for warm white (I know the colour will not match) and the brightest I can get for a standard size of lamp.

Anyone got a decent recommendation?

Thanks!

 

[ibruceuk]

Look up "Long Life Lamp Co" on Amazon. I have 40 of the 6w warm white throughout my house (not my choice, I had to replace 40(!) 50W halogens when I moved in!

 

[bernardgreen]

A trial is being conducted at a friends house where his 12 volt LED lamps are being supplied from an 11 volt supply. Theory suggests the lamps will run cooler ( on 12 volts they get "hot" and not "warm" as claimed in the manufacturer's literature ). The brightness hardly seems to change between 12 and 11 volts.

The hope is that with a lower case temperature the lamps may last longer.

 

[Robin28870]

Hi,

Brightest normal sized warm white LED lamp on the UK market that we've seen (and we've seen a lot) is the Megaman 141751 7w at 550 lumens (verified lumen level).

Hope that helps

 

[boringoldcodger]

I've used one of these for a couple of years:
http://www.alarmsandlightbulbs.co.uk/smd-bulbs-31-c.asp
it seems to me to be pretty bright for 3watts but, unfortunately, they've not reduced the price at all so they now look pretty expensive.

Cheers, Graham

 

[Iggifer]

And they look DISGUSTING

We've been fitting BEL LEDs on the job I'm on at the moment, they're pretty decent. Not sure what wattage they are though to be fair, but they do a few

 

[mfarrow]

Wholesale prices of LED products have moved on immensely over the past few years, but the consumer market has been slow to cascade this change down.

A friend is able to supply Osram strip LEDs with 1 year warranty at a price I forget. But four years ago it would have cost 1.5x the price for a chinese generic item with no warranty at all.

 

[RF Lighting]

We fit nothing but megaman warm white LEDs. We use either 6w or 7w

The 6w lamp is as bright as a 50w halogen.

We've fitted hundreds with no failures. The light is very crisp and clear. There's no 50hz flicker which some lamps exhibit, and the dimmable version seems to work with most dimmers.

 

[Taylortwocities]

A friend is able to supply Osram strip LEDs with 1 year warranty at a price I forget.

wow, that's cheap

 

[securespark]

Found these:

http://www.amazon.co.uk/gp/product/...ue&ref_=ox_sc_act_title_1&smid=A2MBS9M2UUXX1I

10W, 680 lm, 120°, standard size, 2 year warranty.

Have bought some and will report back!

 

[PBC_1966]

I guess these days I'm in a minority, but I find all of these LED lamps horrible wherever I see them. I'll keep LED's for my instrumentation, not for lighting my house.

 

[securespark]

They say there is often (not always) a compromise when choosing something.

I'm happy for a compromise when I see the bill!

 

[RF Lighting]

I guess these days I'm in a minority, but I find all of these LED lamps horrible wherever I see them. I'll keep LED's for my instrumentation, not for lighting my house.

Some of the cheaper lamps are horrible with strange colour temperatures, harsh undiffused light, and cast multiple different coloured shadows, but there are plenty of LED lamps now where you really would be hard pushed to tell any difference at all from a standard incandescent lamp.

 

[ericmark]

A trial is being conducted at a friends house where his 12 volt LED lamps are being supplied from an 11 volt supply. Theory suggests the lamps will run cooler ( on 12 volts they get "hot" and not "warm" as claimed in the manufacturer's literature ). The brightness hardly seems to change between 12 and 11 volts.

The hope is that with a lower case temperature the lamps may last longer.

It would be interesting to see the results? With 230 volt lamps to use a simple resistor to control the current is not really an option, but with 12 volt when I see 3, 6, or 9 LED's I start to wonder at 3 volt each can't really squeeze in 4 LED's in series on 12 volt but 3 will go nicely.

I look at this advert:-

The point is very near 100 lumen per watt, and it would seem that's about right for a LED lamp. But the down side is £14 each and DC. Clearly some sort of switch mode regulation be it called switch mode or pulse width modulated it's really the same thing. But when I looked at my MR16 lamps looking at 60 to 70 lumen per watt clearly using some cheap and nasty way to regulate the current.

As to looking at the lamp in my living room 10 lamps 9 are 3W and one is 1.4W I have asked many a visitor to identify the 1.4W and in the main they fail. I also swapped a tube 5100 lumen to 2400 lumen again could not notice it being any dimmer. However have noticed I need to ware my glasses more to read things. I think our brain associates colour with brightness and we think if reddish it's dim and blueish it's bright and since dimming a LED does not change colour we don't see it as being dimmer.

 

[JohnW2]

A trial is being conducted at a friends house where his 12 volt LED lamps are being supplied from an 11 volt supply. Theory suggests the lamps will run cooler ( on 12 volts they get "hot" and not "warm" as claimed in the manufacturer's literature ). The brightness hardly seems to change between 12 and 11 volts.

Do I take it that these are 'cheaply made' LEDs without a 'proper' constant-current supply to the LED elements? If not, then small changes in supply voltage would, of course, not be expected to make any material difference.

The hope is that with a lower case temperature the lamps may last longer.

If the lower temperature were achieved, then I guess that might well be true. However, if the LEDs last even remotely as long as they are 'meant to' at their intended voltage, is lamp lifespan really something to be concerned about (particularly for those of us who aren't as young as we used to be!)?

Kind Regards, John