what light temp is this

scott06

great post Doc....perhaps you would be interested in posting a new thread on this info, it is worth speading around so it's common knowledge on the site..rather than hidden here at the end of an older thread....thanks!

Dr.Chrondo

Yeah that's a good idea. Ill do that here in a little bit.

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ISO2BWELL

OK Doc...If you were correct, based on your reply, anyone who knows me is aware that I would apologize in a NY second.....BUT, can you tell me from the bulb's part# what the kelvin temp is?

Or, did you research the lamp's part number?

Here is the URL to the General Electric CFL catalog. Put the part number in the search window and see what ya get.

http://genet.gelighting.com/LightPro.../r00016v-1.pdf

The lamps are also available through True Value Hardware stores. Here is their info on them:

GE, FLE26HT3/2/SW/CD/2PK, 2 Pack, 26W, Sof t White Spiral Compact Fluorescent Bulb, Electronic Ballast, Medium Base, MOL 5.1", 1700 Lumens, 8000 Average Hours, 2700° Color Temperature, CRI = 82, Energy Star Approved, 5 Year Consumer Guarantee, Clam G E LIGHTING

The lamps part number is clearly visible in the image provided via the link in Leap's first post. Hell, just take that part# and Google it...TONS of info on it.

Gotta do the homework before ya go telling someone something that is critical to their plants.


ISO

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Dr.Chrondo

Okay let me break this down one more time. Now that we know what the letter abbreviations are for let us inspect the model number of this bulb. Model number is FLE26HT3/2/SW. THe SW stands for Soft White Spectrum which has already been established as a 3000K bulb. So the bulb is 3000K.

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ISO2BWELL

Like hell it is.

The GE CATALOG, and the lamp is MADE BY GE, shows the lamp at 2700k.

No doubt you know something about lights, but don't tell me I can't stinkin read. If you think that lamp is 3000k and they publish 2700k in their spec's, then go tell GE to change it.

Will you post a link to somewhere official that clearly states that all Soft White lamps are 3000k?

I ain't trying to be difficut, but damnit, I ain't stupid either.



ISO

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ISO2BWELL

Now here's a bit more info on Light Colors, etc.:


Two Ways to Look at Light

There are two systems of measurement commonly used to describe the color properties of a light source: “color temperature,” which expresses the color appearance of the light itself, and “color rendering index” (CRI), which suggests how an object illuminated by that light will appear in relation to its appearance under other common light sources. Both can be extremely valuable in evaluating and specifying light sources, but it is important to understand their limitations.

Color Temperature–the Appearance of Light

The color temperature of a light source is a numerical measurement of its color appearance. It is based on the principle that any object will emit light if it is heated to a high enough temperature, and that the color of that light will shift in a predictable manner as the temperature is increased. The system is based on the color changes of a theoretical “blackbody radiator” as it is heated from a cold black to a white hot state.

With increased temperature, the blackbody would shift gradually from red to orange to yellow to white and, finally, to blue white. A light source’s color temperature, then, is the temperature, measured in degrees kelvin, expressed in kelvin (K), at which the color of the blackbody would exactly match the color of the light source. For many light sources an exact match cannot be achieved. In such cases, the closest possible match is made, and the color is described as correlated color temperature. An OCTRON® T8 fluorescent lamp with a color temperature rating of 4100K, for example, has a color appearance similar to that of a blackbody heated to 4,100 kelvin (3827°Celsius, 6920° Fahrenheit).

Warm vs. Cool–the Psychology of Light

Some people find it confusing that low color temperature light sources are called “warm” while those with higher temperatures are referred to as “cool.” In fact, these descriptions have nothing to do with the temperature of the blackbody radiator but refer to the way color groups are perceived—the psychological impact of lighting. Colors and light sources from the blue end of the spectrum are referred to as cool, and those toward the red/ orange/yellow side of the spectrum are described as warm.

How Light Affects the Colors of Objects

Color rendering index (CRI) is a system derived from visual experiments. It assesses the impact of different light sources on the perceived color of objects and surfaces. The first step is to determine the color temperature of the light source being rated. Next, each of eight standard color samples is illuminated—first by the light source and then by a light from a blackbody matched to the same color temperature. If none of the samples changes in color appearance, the light source is given a CRI rating of 100. Any changes in color appearance which do occur result in a lower rating. The CRI decreases as the average change in the color appearance of the eight samples increases. Any CRI rating of 80 or above is normally considered high and indicates that the source has good color properties.

Color Temperature and CRI–Useful References

Color temperature and CRI provide some helpful information, but they are not perfect. Color temperature, for instance, fails to indicate anything about how a given light source will render colors. For example, imagine two “cool” light sources with similar color temperatures and color appearances. Suppose light source A produces fairly uniform energy, Suppose light source B, which looks the same, produces a similar spectrum except with almost no light in the red. Red objects which appear natural under light source A will therefore look dull and colorless under light source B even though both lights have the same color temperature.

In general, a high CRI figure means a light source will render colors well. However, since CRI figures are calculated for light sources of a specific color temperature, it is not valid to compare a 2700K, 82 CRI light source to one of 3500K, 85 CRI. In addition, remember that CRI is an average of eight different colors. This means that a light source with a high CRI will tend to render the broad range of colors well, but it is not a guarantee that any specific color will appear natural. Used in conjunction, however, color temperature and CRI can provide excellent benchmarks for the comparison of light sources.

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ISO

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scott06

with all this info - which I find interesting - let's keep in mind the simple questions most members have when they post

Is this light good for veg and or flower?
is is strong enough to cover my grow area?

folks like Iso, Doc, and myself love all the little details - but these details are apt to confuse the new grower as help them - they want and deserve genral guidlines that they can understand and specific recommendations on a product or technique

weather the darn bulb from the beggining of this bulb is 2700k as I orginally suggested or 3000k as Doc thought it is still fine for flower and that's all he really wanted to know

also Doc I'd be careful getting into a pissing contest with Iso on this...the depth of his knowledge continues to amaze me.

ISO2BWELL

If anyone reads the (plagerized..LOL) tutorial in my post above, you can see the BEST CFL you can get for flowering would be the 2700-3000k range, and with the HIGHEST CRI index you can find. This means the colors of the light will be sharper to the plant, and in the correct spectrums.

ISO

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snickelfritz

The specs on the bulb listed show it is a 2700K.

15519 FLE26HT3/2/SW/2PK 3 120 8000 1750 1400 2700 82 5 0.6 120 ✐ B ★ T3 Spiral®, Carded Twin Pack 153 1,7,8,9,10

If you have to look for yourself... Open up the PDF file ISO provided from GE. Page 10, bottom three. (Same bulb, different packaging.)

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scott06

and with that we have established that terms like soft white are not yet fully standardized despite Doc's certainty that it is....so our CFL tutorial is still up to date and perfect reading for anyone confused on this matter

http://www.greenpassion.org/f22/cfl-tutorial-2592/ it's something I re-read every few months to keep my CFL thoughts clear.