Re: LED Mafia and IncaNdescent Technology
Good.
Uncontrolled aspects, namely?
Alright, I'll try this way instead. Both bulbs start out at 3000 K, and the change in CCT is a given function for all incandescent bulbs. Hence you can find out the point where tungsten melts and your bulb undoubtedly fails.
If you take a look at Osrams halogen guide and do regression on the chart of true temperature-CCT, you find that CCT = 8.749207582·10-1 T^1.019488766.
If you set T to tungstens melting point, 3695 K, the CCT at that temperature becomes 3794 K. Hence, you can go no higher.
Now, the CCT for your bulb at 24 V is 3979 K, and 3979 > 3794.
Although some second order effect probably comes into consideration here, you are 200 K away from the absolute maximum.
Winny, the uncontrolled aspects which I have said a number of times are that you did your tests with an entirely different 35W bulb, with different filament, IRC, resistance, and glass construction. It is even possible that there is a slightly different composition of this filament in terms of purity which fluctuates in all manufacturing processes.
You tested a completely unique 35W bulb and then assumed the 90W must be the identical filament alloy (or purity of just tungsten), internal bulb pressure, IRC coating, and that all other specifications & tolerances must be identical. I also raised the question of you using probe pincers which if like my Fluke brand have a rated limit of 1A, because I do not know how much of them heating up may have contributed to the bulb flashing since they had direct contact with the bipins. I also question whatever chart you just posted, since I have not seen how its formulas and calculations are done to know it maps out at the high extremes.
The fact that I question some of these variables is a matter of good scientific modality. If you read my words carefully, I never have said your assertions are wrong. I have only stated my empirical observations in my own light, while not knowing what the actual measured voltage would be if I measure peak bipin voltage in the light with a freshly charged pack inserted.
If you are representing that your testing and photographs provide irrefuteable evidence of what happens in a whole other bulb in an entirely different testing environment, then questions on test modality and calculations are reasonable tests of objectivity. Again, my questions do not mean you are ultimately wrong, just that I see that you have not controlled all the elements to backup your extrapolated claim about the actual 90W bulb's capability when properly inserted into a KIU heatsink setup.
I did not bring up additional factors such as ambient air temp, barometric pressure, verified calibration of your power source, and all the other things which must be done for proper industrial published test results to be considered valid. They can all be considered as legitimate questions that an intelligent observer should have in mind when someone tells you something like this is absolutely true.
Now, if I had said that your findings are absolutely wrong, then I would be required to do several, repeated tests with as many of the variables I can think of be controlled, and to publish those testing procedures for anyone else to reproduce. I did not say that about your findings....I just say that I question some of the uncontrolled aspects of your testing and extrapolation.
In addition,
I have said repeatedly that I posted the initial AWR spreadsheet ONLY to show there is an incan bulb (among many) that at default voltages can run for 4,000 hours to dispell the LED Jockeys who claim that incan bulbs don't last since they put an extra bulb in the tailcap. It is not my job or interest to defend the extremes of AWR's Hotrater spreadsheet since you and I both know its accuracies break down as you move away from minor overdriving.
Let's say I had originally posted this even more extreme manipulation of AWR's sheet the voltage calculation, to again illustrate that this is a 4,000 Hour bulb at default values. Because there is still 0.2 Hours then it must mean that this bulb can be driven to 30,000BL !!!
Stop being daft about this whole spreadsheet, Winny. It demeans your more rigorous and valuable contributions, since you already went down this road in other threads and know its limitations. Your beef is with AWR's Excel calculator which is used all the time (as is the WA URL Re-rating links) in promoting the lumens of many lights because no one has a 100% accurate way of evaluating hardly any of the various lights we discuss here on CPF. Similar claims are made with HIDs, LEDs, Lasers, and Lanterns.
Some people use a light meter reading of a supposedly scientific ceiling bounce test, and present it as real lumens. Almost no one discriminates between BL and TL. No one has an accurate way of discussing the effects of reflector surfacing, shape, and size. Almost no one includes variables of glass lens quality and thickness, nor condition, type, and quality of batteries used when lumens are batted around publicly.
You can take this criticism and examination of light performance down to a gnat's *** in details where you will find out that almost none of the claims that anyone is making about anything is actually fully controlled and scientifically verified and calibrated.
None of that however, dispells the reality that next to incan hotwires, LEDs are like capgun toys in terms of the lumen output. It's too bad that LED Jockeys cannot hear that, because it is the obvious reality...albeit at lesser incan efficiency.
Individual LED total lumen output may change in the future, but nothing on the horizon that I have seen is close to displacing incand hotwires. I don't consider multiple LED lights to be the same apples to apples comparison to a single overdriven incan bulb.
Similarly, HID's are generally more powerful and practical than most incans, which is why I have a good number of them. However my Larry14K and Deathblaster do appear on empirical observation to be brighter than my Barn Burner which is reportedly in the 8,000 lumen range. Then you can always move into carbon arc sky spotlights and the MaxaBeam/MegaRay.
What was it under load?
himself. Or maybe his grandmother is dying of cancer. Hmm. If it's something like that, hang in there, LL.
