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THIS AUCTION INCLUDES TWO
5000K DAYLIGHT 55 Watts Top-Spiral FLUORESCENT BULBS.
e-GoldMountain 55 Watts high-output daylight balanced compact fluorescent (CFL)
bulbs ideal for digital product photography and video shoot.
Our Popular 55 Watts daylight
balanced compact fluorescent (CFL) bulbs are ideal for product photography and
digital video shoots. Its output is equivalent to 250 Watts incandescent
per bulb.
The high output lumens make it great to get good exposure for darker objects.
It fits most standard Photo fixtures.
| Specifications: |
| Watts (energy consumption) |
55
Watts=250Watts incandescent bulb |
|
Lumens (measured brightness) |
3600
Lumens |
|
Measured Color Temperature |
daylight 5000K |
|
Measured Color Rendering Index (CRI) |
> 84 |
|
Operating Temperature |
cool
("flicker free") |
| Need
color correction? |
No |
| Hours
of life |
8,000
hours |
|
Standard |
Energy
Star Compliant, screw into standard sockets |
| Bulb
measurements |
8.39"
length (L), 4.45" diameter (D) |
| Base
measurements |
4.06"
length (H), 2.95" width (W) |
|
Certificate |
UL/CUL/FCC |
|
 |
Brand new in good
package
Please note
that We also have 30 watts CFL bulbs selling on eBay,
Click here to see.
Why
is our top-spiral FE-US model is the best CFL bulbs in the market? The following
pictures show the luminous intensity distribution comparison among our top-spiral FE-US model and other mini/standard-spiral FE-II and FE-IIS models.
We take 15 watts bulb as an example.
Why
is it ideal for product photography? The following pictures show the fact.
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The picture above
was taken in an indoor environment
illuminated with 100 Watts
incandescent light
by Canon Camera S30
-- Auto mode and
flashlight shut off,
03/20/2006 |
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our daylight
balanced compact fluorescent bulbs
by Canon Camera S30--Auto mode and
flashlight shut off , 03/20/2006
WITH OUR CFL BULBS, TRUE COLOR PRESENTATION --
NO COLOR CORRECTION NEEDED!!!
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The following Photos were
taken in our studio, illuminated with
our daylight balanced compact fluorescent (CFL) bulbs
by Canon Digital Camera
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More Best-buy:
Product Photography Kits |
Tips
for choosing photo studio's bulbs
The high-output daylight balanced
compact fluorescent (CFL) bulbs are ideally suited for digital photography. The
daylight color eliminates the need for color correction. They also have very low
heat so they don't get hot like the more common photo bulb choices. Long
bulb-life means these bulbs will last for years. They are also energy-saving
bulbs. The lighting effect of one 55 Watts compact fluorescent bulb is
equivalent to that of 250 Watts Incandescent bulb. Color temperature, Color
Rendering Index (CRI) ratings and lumens help select appropriate bulbs.
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What is "color temperature"?
Color temperature, officially
known as "Correlated Color Temperature" (CCT), is an important measure of the
color of light produced. The CCT value is available for all light bulbs,
including CFL bulbs, and helps you choose the appropriate bulb for your
application.
Color temperature is measured in degrees Kelvin (K). Imagine a piece of metal
being heated. As its temperature increases, the color of the metal will
gradually shift from red to orange to yellow to white to bluish white. The color
of light is measured along this scale. This table lists the typical color
temperature of various light sources. We recommend daylight balanced compact
fluorescent (CFL) bulbs with color temperature 5000k-5500k. You can find a lot
of CFL bulbs in your local store. However, it is hard for you to find daylight
balanced CFL bulbs with color temperature over 5000k locally.
What is "Color Rendering Index?"
The "Color Rendering Index" (CRI) describes the way colored objects appear under
a given light source. The CRI value is available for all light bulbs, including
CFL bulbs, and helps you choose the appropriate bulb for your application.
CRI is measured on a 100-point scale, with 100 being a reference value of a
particular incandescent light. A low CRI indicates that objects may appear
"unnatural" under the source, while a light with a high CRI rating allows an
object's colors to appear more "natural." Lights with CRI values of 80 or higher
are considered to have a high CRI and do a good job of rendering colors.
In the past, fluorescent lights generally had low CRI ratings. Today's products
are much better. Most CFL bulbs commonly available have CRI ratings of 82 to 84,
considered excellent values. CFL bulbs with CRI values in the high 80s can be
found through other sources. We recommend CFL bulbs with CRI over
80. |
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What is "lumen"?
A typical use for the lumen is to describe how
much light ordinary household light bulbs give off. The packaging usually gives
the bulb's light output in lumens; a new 75-watt incandescent bulb puts out
about 1,180 lumens. To get a good exposure, we recommend CFL bulbs with
lumens over 1900. |
Why the use of daylight-balanced
CFL bulbs eliminates the need for color correction?
There is an important term "white
balance" in photography. It all boils down to the concept of color temperature.
Human brain can quickly adjust to different color temperatures.
Digital cameras usually have
built-in sensors to measure the current color temperature and use an algorithm
to process the image so that the final result may be close to what we see (with
our eyes, of course). But, the algorithm(s) being used may not be accurate
enough to make every situation correct.
Under some difficult situations when the in-camera algorithm is not able to set
the color temperature correctly or when some creative and special effects are
needed, we can instruct the camera to use a particular color temperature to
fulfill our need. This adjustment that makes sure the white color we view
directly will also appear white in the image is referred to as white balance.
Setting white balance incorrectly
may cause a color shift in the image. For example, suppose the camera is told to
use a color temperature of sunlight to take an image of an indoor environment
illuminated mainly by incandescent lights. The camera will expect excessive blue
light and less red light, and set its algorithm to be more sensitive to the blue
light. However, in an environment illuminated with incandescent lights, color
temperature is low with excessive red light rather than the blue one. As a
result, we shall see a reddish or yellowish image. But daylight-balanced CFL
bulbs have no this problem since it emits daylight color. The above pictures
shows an example. The fact tells everything.
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