Diet Smith figured that out long ago.
Posted on 11/07/2016 1:06:47 AM PST by LibWhacker
Both are very poor substitutes for incandescent light bulbs.
When we were told we would no longer be allowed make those bulbs we really screwed up. There is no good substitute for them. Actually the so called Halogen lamps are, but they are costly, don’t last very long and give off more heat.
Wonder if we will ever get our head out of our collective A and deal with bureaucrat stupidity?
Diet Smith figured that out long ago.
define crappy?
You can hardly read by them. It will light the room well enough so you don’t run into things but try to shoot a photo under “daylight” LED light bulbs and you won’t be able to view the pic well at all. Take the same picture under even shaded daylight, it is like night and day comparisons.
I knew the LED light was not pleasing light, but until I took photos under it, I did not know why.
I have 6 so called 60W (by lumens) (9W power consumption) LED light bulbs over my kitchen table. Compared to the incandescent lamps that were previously in the fixture we have <1/4 the light level (not measured with light meter). And the glare is much worse.
Interesting. I have been slow to adopt the LED devices at home; I bought large numbers of tungsten bulbs before they were banned. The LED bulbs I have installed are all marked as having a “2700K” color temperature. This is heavily weighted towared green/yellow. I find the “cool white” 5000K color temperature to be too blue and harsh. My experience with the brightness has been opposite yours; in general a “60W Replacement” LED bulb seems brighter to me than an actual 60W tungsten bulb. Curly bulbs definitely seemed dimmer, to me.
Thanks for the graph. If it is accurate as to emission level, looks like LED lamps produce roughly 1/2 the emission of an incandescent lamp. And that the emission of the LED lamp has a pronounced spike of intensity and rest of the spectrum is 1/2 that spike level.
That uneven emission spectrum might explain why it sucks to read by.
Since I didn’t produce the graph, I can’t speak to the relative heights of the graphs ... I find it hard to believe they are to scale, though. That red LASER should be off the chart relative to the tungsten filament. The LED spectrum they represent looks like a cool-white to me. In a warm-white spectrum the blue peak is lower than the green-yellow peak. I have seen no white LED that produces significant red, unlike the tungsten which is heavily weighted to the IR. In fact, most of the light coming off a tungsten bulb is IR; invisible to any human.
You are obviously in the trade or the engineering side.
I was in the wholesale hardware distribution business for 35 years. Sold a lot of lighting. But it was before the new options existed. I did sell sodium and mercury vapor replacement stuff. And quartz halogen lamps.
I have a commercial radio license and an Amateur Extra. But never worked in that field. I understand the theory pretty well, but optical radiation was not something I studied. Thanks for the clarification.
Will Tom Swift be the pilot?
I’m supposedly some sort of engineer ... I don’t work in the lighting trade, though. For whatever reasons I have to know a few things about various light sources from the POV of spectroscopy. Most of my interest is actually in the infrared (SWIR 1000-2500nm). Professionally, I hate LED and fluorescent lights, as they produce nothing in that region. Quartz-halogen actually produces better SWIR illumination than visible.
...But microwave is not like laser energy where it is focused. Microwave can be beamed, but it does disperse over distance...
Microwave energy most certainly can be focused like a laser.
It’s called a Maser.
OK, I stand corrected. I had heard of Maser but frankly did not understand it.
Just read a little about it and realized I was at a site once. I got the tour of the VLA site in Datil, NM when they had the first 3 dishes operational. They were using cryogenic receivers then. Then came along the GASFETs.
We visited the VLA in 2010 on our way back across the country.
Neat place!
Yes, it is. I got the tour from one of the engineers. Amazing lab area.
Was impressed with the waveguide. It was about the size of a 2” iron pipe, made out of ferrite material. 1/4 wavelength wall thickness at the IF frequency. Inside was a spun copper wire layer, it appeared to be about the size of 18 ga. wire. Not sure I remember the IF frequency, but think it was somewhere between 2 & 3 GHZ.
The signal was converted down at the dish to the IF frequency and phase compared at the central point where it acted as if the antenna was effectively 1 mile in diameter and stearable.
The dishes were on rail cars and were movable. I don’t remember the size of the dishes, but they were pretty large.
Inside the building was a heavy steel door going into the vault which had finger stock sealing the door. The vault is where the rest of the receiving equipment was located.
There were a lot of computer monitors scattered through the open area in the building.
Quite a nice facility.
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