Has anyone fitted any, looking for a decent supplier with a good quality product.
looking at Normal wholesalers not internet based companies
CRI greater than 80 +
cheers

Contact Lightfoot LED and talk through your requirements.

They only deal in LED lighting and the owner is quite an expert in this field.

Their prices are at least as good as any of the national wholesaler chains, but their knowledge, advice and variety of products are better.

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S George
http://www.state-it.com

You could have a chat with Thorlux as an example - they have LED versions of thier XL 5 Daylight luminaires.

CRI will be at least 80 - we've a few specified on a project at the moment, although not installed yet. I did see a few in a client premises recently - not bad, but difficult to see quite how they provide any real benefit compared with a reasonable quality T5 lamp package with HF modulating gear

Start with a test of say comparing luminaire - lumen/circuit - watt (rather than lamp lumens/watt) for LED and T5 in 600 x 600 luminaires - be an interesting "debate" regarding Part L and EPC's (with the resultant links to BREEAM/DREAM etc)

Regards

OMS

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Failure is always an option

The Thorlux fitting I have seen and is good.

Concord Marlin(Or whatever they're called these days) also do one with all the colour changing gubbins if you want it. Though you are better of with a generic 1 x 55W luminaire.

I'm going to disagree with that - given the fact that the luminaire grid is going to be multiples of 600mm (ie 2400 x 2400 as an example) and with "normal" ceiling heights, the 55W Biax is not that eficient.

In a conventional batwing luminaire (excuse the phrase, but akin to a classic LG3 Cat 2) a 55w unit will give you about 50 luminaire lumens/circuit watt and an LOR of around 60% (not actualy complaint with part L).

In the same luminaire, 2 x 20W T5 would give you about 70 luminaire lumens/circuit watt, and an LOR of over 90% for substantially the same illuminance on the desk.

Principally, the Light Output Ratio (LOR) will vary substantialy between fittings as the 55W single lamp unit needs lots of shielding due to the higher lumen package of the lamp, much reducing as installed efficacy.

The comparisons have to be done based on Lux on the desk and power in to the lighting system

Regards

OMS

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Failure is always an option

OMS,

I was comparing the LED modular I was thinking of against a 55W TC-L , not comparing the TC-L to a T5. Just tried looking it(The LED Luminaire) up but it seems they don't make it anymore (probably cos it wasn't any good).

Mawry

PS the term "batwing luminaire" always makes me chuckle!

OK - with you on that - I think the 600 x 600 I mentioned earlier was a 43w version kicking out about 4000lumens and consuming about 50W

A 55W biax would beat that (at the moment)



LoL - well I did apologise for using it - although i guess you can't deny the polar curve is pretty "batwing" in shape

If you analyse it, the change in intensity with angle (Cosine Cubed relationship) then the illuminance at any point on a horizontal plane is almost identical - god they were boring bloody things

Regards

OMS

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Failure is always an option

43W the one i was thinking of was 80+ W with about 4400 lumen output,(it was about 3 years ago) l think the correct term is it's pants?

The thorlux one is much better, i'll have to get malcolm to bring me in a sample, out of interest!

I have to admit to never analysing a batwing luminaire! i shall put it on the bucket list!:-)

regards

OMS

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Failure is always an option

Now there's a word I've not heard for a while... does bring it home that I'm living 'in exile'!
- Andy.

Tidy butt!

I am indeed back on the right side of the bridge again!:-)

Much thanks for the revision lesson, gotta love the lighting theory!

We have been involved in various projects that utilised these 600x600 layin grid LED panels and the only issues we had was the electronic control gear being very sensitive to over voltages in the installation. One project had 15 lights fail, due to spikes, apparently caused by the lifts within the building. (the power was analysed by a third party). Luckily for us the manufacturer were willing to replace the units free of charge, providing we fitted type 3 SPDs at the first light of each circuit. (DEHNflex modules).

Now I only managed to solve this, following a surge protection course, where the DEHN engineer suggested that this is currently a common problem with LED equipment. This is how I managed to get the manufacturer to replace the units for free (following a dozen emails), as they should really take this in to consideration when selling their products

Touch wood, things have been fine since.

Regards

Jobbo

Sounds as if the lifts are posibly trying to regen back into the supply (running down fully loaded for example).

SPD,s at the lift feeder would be a sensible design solution (ideally within the lift controller and fitted by the lift manufacturer - you'd think they probably understand the "polluting" nature of V^3F

I think the voltage (and temperature) sensitivity of LED drivers is going to be the next real drama in the electrical building services arena

Regards

OMS

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Failure is always an option

going to lux live this year, hopefully will see a few on display, always better to see them i think

We sell a 600x600 LED panel, free delivery anywhere in mainland UK, with discounts on reasonable number of units purchased. Take a look at Hersham Shop LED Panel

Hope this helps.
Sam

Edited: 06 September 2012 at 12:04 AM by SamAdcock