Recommandé
Contenu connexe
Similaire à Nano mod42
Similaire à Nano mod42 (20)
Nano mod42
- 1. Copyright SLP UK Ltd 2013
- 2. Copyright SLP UK Ltd 2013
- 3. Copyright SLP UK Ltd 2013
- 4. Simplest possible case Yellow source no losses 100 % transmission Red source 20 % reflection 10% from each face 80 % transmission Add a simple prism Yellow source 20% losses 80 % transmission Red source 100% transmission Copyright SLP UK Ltd 2013
- 5. Output without panel Output with panel Copyright SLP UK Ltd 2013 Transmission % = Output with panel x 100 Output without panel
- 6. Copyright SLP UK Ltd 2013 50 % transmission Opal 70 % transmission Opal The shape of the distribution is the same the only difference is amount of light transmitted. Does the light from an opal sheet go in a useful direction ?
- 7. Copyright SLP UK Ltd 2013 70 % transmission Opal Nanoprism Nanoprism increases intensity to the working plane
- 8. Copyright SLP UK Ltd 2013 Elevation angle 70% Opal cd/kLm Nano cd/kLm Nano % lower 60 97.5 95.0 2.5 65 82.1 71.0 13.6 70 65.8 50.8 22.8 75 49.1 34.1 30.6 80 33.2 20.5 38.2 85 16.3 8.6 46.9
- 9. Copyright SLP UK Ltd 2013 2000 2500 3000 3500 4000 4500 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 Luminancecd/m2 Source Lumens/m2 Nanoprism limiting luminance Series1 From the graph above we can see that the limit for meeting 3000cd/m2 is 14200 Lumens per m2 input from the source. For a luminous area of 585 x585 mm this equates to 4800 Lumens input.
- 10. Copyright SLP UK Ltd 2013 Nanoprism is efficient: • As we have stable production transmission is at 89%. Practical measurement. • Nanoprism increases useful flux delivery to the working plane • You can use fewer or lower power luminaires to achieve the same illuminance specification. • Nanoprism decreases intensity above 65° • You can meet low luminance and cut off specifications, we can easily predict Nanoprism behaviour for any specification
- 11. Copyright SLP UK Ltd 2013 Nanoprism controls the distribution of LED sources
- 12. Copyright SLP UK Ltd 2013 Add Nanoprism strip Smooth Illumination Profile
- 13. Copyright SLP UK Ltd 2013
- 14. Copyright SLP UK Ltd 2013 Edge Lit LED 2D Lamp replacement Nanoprism Panel Expensive Emitter panel- by A N Other Replacing original panel with Nanoprism, Better appearance, 10-15 % more output
- 15. Copyright SLP UK Ltd 2013
Notes de l'éditeur
- Hello and welcome to our presentation on Nanoprism
- This presentation will cover all the important factors of Nanoprism -firstly what is Nanoprism? -secondly what does Nanoprism do? -and finally what is Nanoprism for??
- Nanoprism was developed primarily to solve a problem that exists with LEDs used for lighting. LEDs are actually just celebrating their 50th Birthday, first practical development was a red LED by GE used as a replacement for a signal lamp. Gradually other colours were developed, green and blue. Then about 10 years ago white LEDs became practical. Up until really quite recently LEDs were not efficient enough in producing light to rival conventional sources. But about 8 years ago LEDs that could beat Halogen at about 20 Lumens per watt became available. Gradually While light LEDs have become more and more efficient and the White has become more like conventional sources - Early LEDs were very blue- white producing a cold white light. Now it is possible to get LEDs built into luminaires where the light is acceptable i.e. a warm white and the system efficiency - taking into account all of the losses can be the equivalent of a good T5 fluorescent luminaire i.e. 80 – 90 Lumens per watt. This opens up LEDs to a much larger potential usage.
- Nanoprism is very highly transmissive. Now we have stable production we are getting consistent 89% transmission. But transmission is a parameter that is very easy to manipulate to get good answers. In fact a figure of transmission for anything other than a clear sheet or a pure Opal sheet is largely meaningless. The above example is about the simplest illustration of this point imaginable, the simulation physics in these simulations is kept very simple- complex effects are not added we are only looking at reflection at surfaces of transparent media. As you add more complexity the situation as what is transmission and what effects it only gets worse For a flat panel the yellow source produces a high transmission. When we add prisms the Red source produces a high transmission. For any medium that transmits light that alters the direction of the output light the transmission will depend on the direction and characteristics of the input light. If you have a sufficiently good understanding of what is going on-it is not beyond the whit of man to manipulate the circumstances of measurement of transmission to get the highest possible figure Regardless of whether this figure can be relevant to a practical scenario.
- We try to get the most practical case. We take the luminaire with LEDs installed . We measure the total amount of light in Lumens that comes out of the luminaire IN ANY Direction Then we put the Nanoprism onto the luminaire and measure how much Light in Lumens comes out of the panel. This gives us a PRACTICAL BULK TRANSMISSION % that actually means something. It is relevant to what a luminaire manufacturer will do. It is a realistic prediction of what will go on in a luminaire. For Nanoprism production units we consistently measure 89% transmission measured in a practical manner.
- When we have demonstrated Nanoprism to potential users the most widely compared product is an Opal sheet. Opal sheets are cheap, they hide the LEDs so why use Nanoprism ? A perfect diffuser is completely non directional as it appears the same from any angle of view. An opal panel has the characteristics of a diffuser but it provides only channel of control. Here is a simulation of a small LED source behind a 70% Transmission diffuser, a 50 % transmission diffuser. The distributions are identical, the only thing you can control with an opal is how much light it lets through. In this case changing from 50 % transmission to 70 % transmission Changes the Nadir intensity from 8 to 12 Candela. There is no directional control.
- Comparing Nanoprism to Opal Here is a comparison of the same small LED source between 70% transmission Opal and Nanoprism Flux from the upper portion of the distribution is redirected to be more downward The result is an increase in Nadir intensity- the intensity directly under the panel- from 12 cd to 19 cd
- The previous Polar curves did not look all that dramatic, most Polar curves are scaled by the processing software so that they fill the diagram. Here is the 70% Opal Vs. Nanoprism scaled the same . As you can see it is quite dramatic. Superimposed is the 65° elevation line. Most luminance control specifications in Europe- like EN 12464 call for reduced luminance at 65 degrees and above. So although Nanoprism provides more downward intensity, it also has Lower intensity- hence luminance at and above critical angles. For the same Luminous flux input over the same luminous area Nanoprism will have 14% lower luminance at 65 degrees 23% lower luminance at 70 degrees.
- We now have more experience with Nanoprism over a variety of luminaires with different configurations. Nanoprism because of the way it is designed is very insensitive to the arrangement and type of LEDs that put behind it. Luminance depends on the amount of light emitted per unit area- Luminance requirements are specified in cd/m2. If you put an amount of Lumens through a large area you will see a low luminance. If you put the same amount of Lumens through a small area the luminance will be higher. If you have a small luminous area you can only put a small amount of flux through it before you exceed any luminance limits. We can categorise Nanoprism for any particular luminance against how many lumens you can emit per unit area. When we plotted the available data for Nanoprism the result was a very straight graph which we can use to plot any particular limiting luminance for any luminaire size.
- Calling Nanoprism a diffuser is doing us a disservice. We must call Nanoprism an Optical Controller- the emphasis being that Nanoprism .controls the light. An opal sheet is simply a diffuser
- Nanoprism controls the distribution of LED sources, it can be used in very simple luminaires, without any re tooling or extra manufacturing investment to make an effective LED luminaire. Step 1 Take a T5 recessed luminaire Step 2 Replace the T5’s with off the shelf LED modules – available from many manufacturers- Philips, Tridonic, Osram<Sylvania, GE etc etc Step 3 Add Nanoprism- That’s it- an Efficient, controlled, luminaire, Low glare, meets all specifications, can be used for offices, retail.
- Adapting Wall wash luminaire to Linear Led module Impossible to get light at he top of the wall without having an undesirable hot spot. Also the LEDs can be seen directly from some angles Adding a Nanoprism strip at a slight angle has 2 effects It controls direct view of the LEDs and It smooth’s out the distribution.
- Adapting Existing T5 louvres Removing T5’s adding linear LEDs- the result was aesthetically awful You could see the LEDs the distribution was also severely effected, efficiency was bad as a lot of light was not “ducted” by the louvre Add Nanoprism in VEE formation—Softens View of the LEDs- it turns the LEDs into T5’s Distribution and efficiency were back where they should be, this luminaire has been submitted to the client for approval.
- Edge Lit, We have not done much work on Edge lit systems---YET. WE are working with a large manufacturer on an Edge Lit 2D replacement system Replacing the original – supposedly special Edge lit emitter panel with Nanoprism- yielded 10 -15 % more output and a better appearance. The development is now proceeding with Nanoprism only