BANNED: Incandescent And Halogen Light Bulbs

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Logan-

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May 26, 2018
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Problem is my light only takes LEDs. I am trying to figure out what the most Peaty LED would be.

If the problem is caused by the light bulb sockets, then you may be able to change them, to get ones that are compatible with high energy, high heat light bulbs.
 

nad

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Aug 16, 2016
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Except the sun i believe it is the best kind of radiation you can receive. I have recently installed a full glass window in my fireplace, and subsequently realized that by getting naked in front of it and rotating was amazing IR therapy. 10-15 minutes would have you pouring sweat on the floor. A completely different world of experience than sitting in front of a 500w halogen light, which i found useless.
Why you need glass window?
 

nad

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Aug 16, 2016
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Because a fireplace works like ***t if it is open.
, thanks. Do you use gas or wood? How much wood that is so ***ty?:cat: And didn't you lose some reds bcs. of glass?
And glass is not cracked?
 

rei

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Aug 6, 2017
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Wood. A fireplace simply does not burn well unless it is in a closed space where primary, secondary air and draft can be adjusted. Glass mainly blocks medium and far infrared. So deep red/near infrared goes freely through. The glass is of course heat resistant.
 

nad

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Wood. A fireplace simply does not burn well unless it is in a closed space where primary, secondary air and draft can be adjusted. Glass mainly blocks medium and far infrared. So deep red/near infrared goes freely through. The glass is of course heat resistant.
Aha, thanks, soo want to try it, need colder weather :fire:, for me also big plus is that I can watch it's magic endlessly.:oops
 
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Logan-

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I think the reason @schultz likes them is described in the description section of that page:

Description
Enjoy a more reliable and longer-lasting light by replacing 75-Watt incandescents with the 90+ Lighting A21 LED bulb. With a high color rendering index (CRI) of 93, this LED bulb emits a color matched for incandescent bulbs that displays the natural and radiant colors of a room.
LED - A21 - 14W - 75W Equal - 90+ Lighting SE-350.051


A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care and art restoration. It is defined by the International Commission on Illumination (CIE) as follows:

Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant[1]

The CRI of a light source does not indicate the apparent color of the light source; that information is given by the correlated color temperature (CCT). The CRI is determined by the light source's spectrum. An incandescent lamp has a continuous spectrum, a fluorescent lamp has a discrete line spectrum; the incandescent lamp has the higher CRI.

The value often quoted as "CRI" on commercially available lighting products is properly called the CIE Ra value, "CRI" being a general term and CIE Ra being the international standard color rendering index.

Numerically, the highest possible CIE Ra value is 100 and would only be given to a source identical to standardized daylight or a black body (incandescent lamps are effectively black bodies), dropping to negative values for some light sources. Low-pressure sodium lighting has negative CRI; fluorescent lights range from about 50 for the basic types, up to about 98 for the best multi-phosphor type. Typical LEDs have about 80+ CRI, while some manufacturers claim that their LEDs have achieved up to 98 CRI.[2]
Color rendering index - Wikipedia

a very high cri is best rich red and orange lower cri more blue less rich red and orange.

What is a Good CRI?
The color rendering index (CRI) is measured as a number between 0 and 100. At zero (0), all colors look the same. A CRI of 100 shows the true colors of the object. Incandescent and halogen light sources have a CRI of 100.

Typically, light sources with a CRI of 80 to 90 are regarded as good and those with a CRI of 90+ are excellent! The general rule is: The higher the CRI, the better the color rendering capacity.

CRI is independent of color temperature. These are two different things. For example, a 5000K (daylight color temperature) fluorescent light source could have a CRI of 75, but another 5000K fluorescent light source can have a CRI of 90.

This chart is a good depiction of differing CRIs, with each image having the same warm color temperature (2700K):

cri-kelvin-temperatures-02.jpg
CRI - Color Rendering Index
What is CRI? The ultimate guide to the Color Rendering Index
Color Rendering Index (CRI) is an often misunderstood metric of color quality. Yet, for any application where color appearance is important, CRI consideration is critical.

We've developed the following guide to help you understand what it is and how it can help you improve your quality of light.


What is the Color Rendering Index (CRI)?

Put simply, the Color Rendering Index (CRI) measures the ability of a light source to accurately reproduce the colors of the object it illuminates.

This is a seemingly simple definition, but there is a lot going on, so we'll help break it down into three parts

Part 1: Color Rendering Index (CRI) is a score with a maximum of 100

What does it mean to measure the ability of something? Like test scores, CRI is measured on a scale where a higher number represents higher ability, with 100 being the highest.

CRI is a convenient metric because it is represented as a single, quantified number.

CRI values that are 90 and above are considered excellent, while scores below 80 are generally considered poor. (More on this below).

Part 2: Color Rendering Index (CRI) is used to measure artificial, white light sources

Light sources can be grouped into either artificial or natural light sources.

In most situations, we are concerned about the color quality of artificial forms of lighting, such as LED and fluorescent lamps.

This is compared to a daylight or sunlight - a natural light source.

Part 3: Color Rendering Index (CRI) measures and compares the reflected color of an object under artificial lighting

First, a quick refresher on how color works.

Natural light such as sunlight is a combination of all the colors of the visible spectrum. The color of sunlight itself is white, but the color of an object under the sun is determined by the colors that it reflects.
natural_cri.png


A red apple, for example, appears red because it absorbs all colors of the spectrum except red, which it reflects.

When we use an artificial light source such as an LED lamp, we are attempting to "reproduce" the colors of natural daylight such that objects appear the same as they do under natural daylight.

Sometimes, the reproduced color will appear quite similar, other times quite different. It is this similarity that CRI measures.
CRI-Comparisons-low-cri-2.png


As you can see in our example above, our artificial light source (an LED lamp with 5000K CCT) does not reproduce the same redness in a red apple as natural daylight (also 5000K CCT).

But notice that the LED lamp and natural daylight have the same 5000K color. This means that the color of light is the same, but the objects still appear different. How could this be?

If you take a look at our graphic above, you will see that our LED lamp has a different spectral composition compared to natural daylight, even though it is the same 5000K white color.

In particular, our LED lamp is lacking in red. When this light bounces off of the red apple, there is no red light to reflect.

As a result, the red apple no longer has the same vibrant red appearance that it had under natural daylight.

CRI attempts characterize this phenomenon by measuring the general accuracy of a variety of objects' colors when illuminated under a light source.
CRI-Comparisons-high-cri.png


CRI is invisible until you shine it on an object

As we mentioned above, the same light color can have a different spectral composition.

Therefore, you cannot judge a light source's CRI by simply looking at the color of the light.

It will only become evident when you shine the light onto a variety of objects that have different color.


How is CRI measured?

The method for calculating CRI is very similar to the visual assessment example given above, but is done via algorithmic calculations once the spectrum of the light source in question is measured.

The color temperature for the light source in question must first be determined. This can be calculated from spectral measurements.

The color temperature of the light source must be determed so that we can select the appropriate daylight spectrum to use for comparison.

Then, the light source in question will be virtually shone onto a series of virtual color swatches called test color samples (TCS) with the reflected color measured.

There are a total of 15 color swatches:
tcs.png


We will also have ready the series of virtual reflected color measurements for natural daylight of the same color temperature.

Finally, we compare the reflected colors and formulaically determine the "R" score for each color swatch.
CRI-Comparisons-measured.jpg


The R value for a particular color indicates the ability of a light source to faithfully render that particular color.

Therefore, to characterize the overall color rendering capability of a light source across a variety of colors, the CRI formula takes an average of the R values.

Which and how many R values are averaged will depend on which definition of CRI you are using - general CRI (Ra) or extended CRI.


What about non-daylight color temperatures?

For simplicity, we've assumed a 5000K color temperature for our examples above, and have been comparing it to a 5000K natural daylight spectrum for CRI calculations.

But what if we have a 3000K LED lamp and want to measure its CRI?

The CRI standard dictates that color temperatures 5000K and greater use a daylight spectrum, but for color temperatures less than 5000K, use the Planckian radiation spectrum.

Planckian radiation is essentially any light source that creates light by generating heat. This includes incandescent and halogen light sources.

So when we measure the CRI of a 3000K LED lamp, it is being judged against a "natural" light source that has the same spectrum as a 3000K halogen spotlight.

(That's right - despite the awful energy efficiency of halogen and incandescent bulbs, they produce a full, natural and excellent light spectrum).


What are common CRI values and what is acceptable?

For most indoor and commercial lighting applications, 80 CRI (Ra) is the general baseline for acceptable color rendering.

For applications where color appearance is important for the work being done inside, or can contribute to improved aesthetics, 90 CRI (Ra) and above can be a good starting point. Lights in this CRI range are generally considered high CRI lights.

Types of applications where 90 CRI (Ra) might be needed for professional reasons include hospitals, textile factories, printing facilities or paint shops.

Areas where improved aesthetics could be important include high end hotels and retail stores, residences and photography studios.

When comparing lighting products with CRI values above 90, it can be very helpful to compare the individual R values that make up the CRI score, particularly CRI R9.

What is CRI? The ultimate guide to the Color Rendering Index | Waveform Lighting

DOE-Lighting-Facts-Label-1.jpg

What Is High CRI LED Lighting?
 
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opethfeldt

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Mar 12, 2017
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Could you not attach some sort of "filter" to the energy efficient bulb to filter the light into a more reddish hue?
 

Daniel11

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There is lots of places online to buy incandescent light bulbs, for health they have the best spectrum for lighting. Also most hardware and grocery stores have incandescent bulbs in specialty shapes like round or candelabra bulbs, these work fine.
 

biggirlkisss

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Mar 1, 2013
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opethfeldt I have seen from a neighbor many spec sheets for red and amber and possibly in between. You always lose 20% red output so it not worth it I think.. I mean how bad is blue light excluding your eyes. Hard to say. Uva would still be much worse. I talked to a seller that had 90cri that were warm white aka 2700k. That pretty good and can go up to 3000 watts. You want max 1500 watt unless you put two breakers together. Really pricy but 5 year warrently etc. I'm sure leds will keep going down supply and demand.
 

papaya

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Mar 2, 2016
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opethfeldt I have seen from a neighbor many spec sheets for red and amber and possibly in between. You always lose 20% red output so it not worth it I think.. I mean how bad is blue light excluding your eyes. Hard to say. Uva would still be much worse. I talked to a seller that had 90cri that were warm white aka 2700k. That pretty good and can go up to 3000 watts. You want max 1500 watt unless you put two breakers together. Really pricy but 5 year warrently etc. I'm sure leds will keep going down supply and demand.
hi, i need to get 60 watt bulbs for a room lamp. i have led daylight, should i switch to incandescent or halogen? does it make a big difference?
 
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I bought 2 x 40 W 2700K halogen's for my room after running supermarket LED's for the past 2 years. I was blown away by how much better the halogen is. The power and color temperature is the same, but the halogen gives off a light that can only be described as fuller and more pleasing. I don't know what the difference is, I just feel better under this light, and I see better (which I think is due to the better CRI of the halogen lights). Cheap LED are truly ***t, whereas cheap halogen can be rather decent.
 

biggirlkisss

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Mar 1, 2013
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There are leds that are 1800k but the thing is they can use blue and green to make all colors so they will still have a spike of blue. I have also seen leds that are 1800k that have very little blue and blow 130 volt incandescent out of the park in terms of red. Always look at spec sheet.s
 
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Logan-

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ddjd

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Is this a halogen heater?? Seems to red to be halogen.... im trying to work out what filament it is
 

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