Quote from Alan Fletcher

This topic is for technical discussions only.
Moderators : please delete any Rossi-Dissing posts.

Suppose that Rossi actually delivers the SKLed.

I have pre-ordered two. How should I test them?

Our unwritten policy is that those who start a thread, moderate that thread. You decide what is appropriate. If you think someone is being disruptive, say so. If they are stubborn, we will intervene and either delete the post, or move it where it belongs.

Well, if someone actually gets 5 SKleds, and gets them to me, I’ll try them in my calorimeter.

It has run incandescent light bulbs for calibration already. (For heat, not lumens, but it is foil-lined light proof).

Already written here more of six months ago.

Post

RE: Rossi-Blog Comment Discussion

[…]

@ PFD
I would like to add another bit of data about PV cells able to work under low light intensity conditions.

By means of these simplified graphs I extrapolated the most significant performances of this type of PV cells when under the white LED light having the spectrum shown in picture.

lenr-forum.com/attachment/16801/a
As anyone can see these cells can generate as MPD (Max Power Density) more of 75 uW/cm2 when they are under 1000 lux white LED light illumination.

Using the data that the…

truth

Apr 18th 2021

Quote from Alan Fletcher

This topic is for technical discussions only.
Moderators : please delete any Rossi-Dissing posts.

Suppose that Rossi actually delivers the SKLed.

I have pre-ordered two. How should I test them?

Chlorophane

... " In prospect, this work provided deeper understanding of the effect of the activator and sensitizer concentrations on photon upconversion resulting in a simple way to obtain high intensity NIR to UV upconversion for use in optical, chemical and biological applications."

Suspend a thin two-sided thermally conductive black body* plate in a vacuum chamber. You need one optically transparent at the IR thermometer wavelength, and at 5000K. Only 5000K is needed of the TC method is used.

point a spot IR thermometer at one side of it.

Place the SKLED a suitable distance away from the BB Plate such that the other side of the BB plate receives some proportion of the SKLED light.

Switch the light on and off observing the time vs temperature graph of this plate as determined by the IR thermometer.

Calibrate the plate power vs temperature by heating it using some known light source of roughly 5000K - e.g. a halogen bulb.

Note that anisotropy in the SKLED output can pretty easily be estimated and corrected for.

Variants:

• Use a TC to measure the plate temperature instead of an IR thermometer. The TC output would need to go through thin wires.to minimise conduction. IR measurement has the merit that errors due to inhomegeneity in temperature distribution can more easily be determined.
• Replace the plate by a sphere (I don't think this would help, and it would make some calcs more difficult).
• Calibrate using a resistive heater instead of a light source. Heater wire could be bonded to the plate with some thin thermally conductive insulator, the whole thing painted.
• Don't bother with vacuum chamber and hope convection effects can be calibrated out. (I prefer vacuum!).

* e.g. a suitably painted copper leaf. BB at 5000K is required. calibrated absorption for the IR gun id also needed, if not using TCs.

THH

Quote from Alan Fletcher

The landing page for the Ecat SKLed is at

https://ecatorders.com

The specification is at
https://ecatorders.com/specifications/

• Size: Length 15 cm, diameter 10 cm (6” x 4”)
• Weight: 200 grams
• Operational Lifetime: up to 100,000 hours
• Lamp type: LED
• Luminous Flux: >10,000 lm
• Luminous efficacy: 2,500 lm/watt
• Light color: 5,000 K (cold white)
• Beam angle: 60 degrees
• CRI (color rendering index): 90
• Power supply: 110–240V AC, 50/60 Hz, or 12 V DC
• Power consumption: 3.9 W (+/- 10%)
• Recyclable: Yes
• Protection: IP65 (outdoor use)
• Warranty: 3 years

This spec is capable of various interpretations.

If we use the correct one, then since lumens represent power at 683 lm / W we have specified power out / power in = 14.6

However an incorrect specification would be to take the maximum output flux, and work out equivalent lumens for an isotropic source of that flux. This would be the apparent brightness.

60 degrees cone wisth is 0.84 steradians, where the sphere is 4pi => 14.95 reduction in power needed.

Typically, a beam angle of 60 degrees does not imply even illumination so there might be an additional factor, where the flux averaged over a 60 degree solid angle is actually only say 50% of the maximum intensity flux.

So, using this alternative (incorrect, but often used) measure we require a COP of less than 1 - possibly as little as 0.5. That would still be impressive, normal lighting LEDs top out at a luminous efficiency of around 30%.

Existing blue laser LEDs - which could be used here - allow about 60% luminous effiicency. So we are pretty close to meeting (with some creativity in measurement of beam angle possibly meeting) this alternative spec with blue laser light!

https://collateral-library-production.s3.amazonaws.com/uploads/asset_file/attachment/13679/Laser-Diode-Lighting-The-Potential-Future-of-High-Efficiency-Solid-State-Illuminationv_DIGITAL.pdf

Perhaps the SKLED manufacturer could clarify that indeed this is the real light output in lumens as opposed the the equivalent output of an isotropic source with the same flux?

EDIT - I am confused. The 60% efficiency source from that link looks like an LED (labelled SOTA LED), not a laser. Do 60% efficiency LEDs exist?

Quote from Alan Fletcher

Suspend the ecat SKLed in a vacuum, pointing horizontally, and measure the deflection caused by photon pressure when you turn it on.

I was not joking with my method. It is remarkably free of artifacts...

Quote from Alan Fletcher

I added PV to the list of general methods.

I'm not sure it will give an absolute power output, but could certainly be used to compare with a "calibration" lamp.

If you are interested first of all to verify the main claim that is: Ecat-SKEld generates Energy Out>>Energy In, this is a robust way to check it, it's tricks-free and it doesn't need any calibration lamp.

It needs only the starting check of no battery hidden inside or a long time test to exclude it.

In any case this check must be done whatever kind of test you chose.

Clamp or tape a thin black disc to cover the light (..or <ahem> slide small trash pail over large lamp body), and IR the part covering the light outlet. Compare to 10000 lumen LED flashlight with cover. Compare brightness of two lamps without covers.

If you don't have a suitable light-meter there's a very old-school method of comparing brightness. Put a drop of white oil in the middle of a sheet of paper and arrange it between your 2 light sources. The paper becomes translucent and transmitted light from the brightest source will show up as a bright spot on the side with the less bright source. By altering the distances between spot photometer and the two light sources you can do some math and work out their relative brightness.

Far from perfect but an interesting very low cost method.