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Innovations in Light

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No.1 LEDs

Transforming the world of lighting in every sector – Why?

Energy efficiency up to twice that of fluorescent technologies

No lamps and 50,000 life leads to major maintenance savings.

Small size allows for slimmer, narrow & thinner luminaires.

They are free of the restrictive form factors of lamp technologies.

They work well in emergency mode, because they suit DC current.

Dimming LEDs should extend life and is generally better than with T5.

They have lower toxic content.

Those are all the good things, but what are the negatives?

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No.1 LEDs

The negatives

A lot of LED products do not match the claims being made for them *

The initial cost is substantially higher than for a conventional product.

There is a problem of consistency of supply of components

There are often problems of colour performance and stability

The design process is more complex because of rapid evolution

There will be issues of future proofing and product continuity

Most of the life claims for these products are unproven

Overall the positives far outweigh the negatives, and even if it is considered that they don’t , the tide has already turned towards LED ?

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What type of LED to buy?

1. Quality controlled chip with a small flux & colour tolerance (bin).

2. Mounted on a well designed and constructed circuit board.

3. High consistency of colour (>3.5 SDCM)

4. High uniformity of appearance and performance.

5. Future colour stability in mind.

6. High quality/efficient surge protected driver

7. A DALI dimming option

8. Emergency lighting function with DALI central test capability

9. Independently tested photometric files for lighting software

10.Warranty offered is intelligible and credible

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Who to buy an LED from?

The same supplier that you would buy any other lighting from. The question of trust is always important and even more so with LEDs.

You need a supplier that can fulfil that trust in:

• Design • Product • Service • After sales

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Example project comparison – new project T5 or LED?

Kallista 4 x 14w Vs. Kallista LED on 2500 hours p.a. @ 10p/kWh

Fitting Watts Lumens Initial Cost

Est. 5y Cost

4 x 14w 62 3700 134 £232

44 LED 36 3500 203 £248

The 5 year total cost on a per fitting basis are similar, so other factors are driving the growth of LEDs

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Example project comparison

Kallista 4 x 14w Vs Kallista LED on 5000 hours p.a. @ 15p/kWh

Fitting Watts Lumens Initial Cost

Est. 5y Cost

4 x 14w 62 3700 134 £407

44 LED 36 3500 203 £338

The commercial analysis of LEDs depends on project circumstance and a view of the future.

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Example project comparison – point for point replacement

Existing switch start 4x18w Cat2 Vs Zen LED 0n 2500h . @ 10p/kWh

Fitting Watts Lumens Initial Cost

Est. 5y Cost

4x 18w 112# 2900 £18* £176

Zen LED 35 2876 £120 £164

Payback is under 5 years on standard time

* Relamp/clean # CELMA Class C – 71% of ballasts installed in 2000 were at or above this consumption

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Example project comparison – point for point replacement

Existing switch start 4x18w Cat2 Vs. Zen LED 0n 5000h . @ 15p/kWh

Fitting Watts Lumens Initial Cost

Est. 2y Cost

4x 18w 112# 2900 £18* £186

Zen LED 35 2876 £120 £173

Payback is under 2 years on high use / higher cost application

* Relamp/clean # CELMA Class C – 71% of ballasts installed in 2000 were at or above this consumption

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1. Q/C chips from major brands including known information on:

• Flux bins • Colour bins• Drive current• Thermal characterisation

The Technology of LEDs is complex

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2. Quality modules with life data tested to LM-80

• Minimum 6000 h test data for lumen depreciation

• Interpolation of data to L70/B50• 50,000 of operating life• Thermal information on (Tc) points

You must start with good quality LED boards

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3. Colour consistency

• ANSI bins are not acceptable for consistency• Fine binning (3 step MacAdam Ellipse) is

necessary• Bin should be close to Black Body Locus

(BBL)• A.K.A. Standard Deviation Colour Matching

(SDCM)

Ensure you have colour consistency

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4. Colour stability

• LED colour does shift with time/temperature• US study shows substantial shift on some

LEDs• LM-80 6kh shift should be 0.007 uv or less• Temperature should be within operating

window

Understand the issues of colour stability

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5. Optical characteristics

• Uniformity across luminous surface• Colour integrity in all directions• Light distribution / glare level• Surface appearance / texture

Apply a good optical design

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6. Driver quality

• Drivers are most common point of failure• Compatibility with board is important• Case temperature (Tc) data needs to be

known• Interconnection quality is also important

Use a good quality driver

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7. DALI control for dimming

• Interoperability• Soft wiring• Future compatibility• Addressability

Have a DALI option available

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8. DALI control for emergency lighting

• Interoperability• Central automatic test• Monitoring self diagnostic facility• Addressability

A DALI emergency central test option

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9. Independently tested photometrics

• Validated technical information• Dialux photometric engineering• LM-80 life data on key components• Confirmed efficiency of luminaire

Verified photometrics

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10. The product comes with an intelligible warranty

• Clear duration / usage• Clarity of terms and conditions• Not too much small print• From a credible supplier

A warranty worth the name

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No.2 Organic (OLED) or Polymer LEDs (POLED)

What are they?

Usually small glass elements emitting diffuse light

Where are they?

Being used in decorative & low intensity (exit signs) applications

Why not ambient lighting?

Too expensive, not efficient or bright enough and shorter life than LEDs.

What is their future?

Depends on who you talk to. The manufacturing is still difficult and it seems that they are a couple of years away from producing a competitive polymer product.

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No. 3 - DALI controls

Why DALI?

The widest range of drivers is available in DALI, many LED products cannot do DSI and 1-10v is now mainly found on strip/tape products.

What else is driving DALI?

Emergency self – test is now a common requirement and DALI is that standard open protocol. Diagnostics, soft wiring and maintained illuminance are all more popular.

Why not Wireless?

Actuators are expensive and so are most of the peripherals. Effective in small spaces with difficult wiring, but not usually cost effective in large projects. However Harvard have a new system (EyeNut) they claim will change all that.

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No. 4 - LiFi

What is it?

A method of data transfer using LED light fittings pulsing at high frequency.

What are the advantages over WiFi?

Security, speed and segregation of information are three potential advantages, but it is too early to say for sure.

Is it available?

Only in experimental form, but development has been swift over the past 2 years. We may see a number of early adopters start using it in 2014.

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More information – Please Contact

Clearvision Lighting Ltd.2, Elliott ParkEastern Road,Aldershot,Hampshire GU12 4TF

Tel. +44 (0)1252 344011Fax.+44 (0)1252 344066

www.clearvisionlighting.com