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Cowboystudio Full Spectrum Light Bulb- Four 45W Photography Photo CFL 5500K - Daylight balanced pure white light, (Pack Of 4)


List Price: $26.99
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45 Watt
  • Four (4) Daylight 45 W fluorescent light bulbs
3 new from $25.00 3 used from $25.10
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Frequently Bought Together

Cowboystudio Full Spectrum Light Bulb- Four 45W Photography Photo CFL 5500K - Daylight balanced pure white light, (Pack Of 4) + Heavy Duty Muslin Clamps 4 1/2 inch 6 Pack
Price for both: $33.69

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Size: 45 Watt
  • Buy Used and Save: Buy a Used "Cowboystudio Full Spectrum Light Bulb- Four 45W Ph..." and save 7% off the $26.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

Product Details

Size: 45 Watt
  • Item Weight: 1.4 pounds
  • Shipping Weight: 2.3 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B003MU7D0U
  • Item model number: 4 x 45/5kbulb
  • Average Customer Review: 3.4 out of 5 stars  See all reviews (85 customer reviews)
  • Amazon Best Sellers Rank: #503 in Camera & Photo (See Top 100 in Camera & Photo)
  • Date first available at Amazon.com: May 18, 2010

Product Description

Size: 45 Watt

*Wattage: 45 watts, *Designed for our continuous video lighting, *Approximate incandescent equivalent: 200 watts, *Light output: 2,650 LM, *Length: 7.5 inches, *Diameter: 3.0 inches, *Base height: 3 inches, *Base width: 2.63 inches, *CRI (color rendering index) > 90, *Color temperature: 5500 K, daylight, *Designed for use at 120V/60 HZ, *E26 standard screw-in base, *UL listed, energy compliant, *Average life: 10,000 hours, *Save 155 watts in energy over the life of the bulb, *Flicker-free, *Not for use with timers, photocells, dimmers, and motion control devices, *Not for use with totally enclosed recessed fixtures, *Not for use where exposed to the weather

Customer Reviews

That one failed in 1 month.
S. Hong
This bulb is used in a photography tent to shoot objects needing great light.
R. ANDERSON
These bulbs are kinda' large, but put out a good quality light.
Tom W

Most Helpful Customer Reviews

46 of 50 people found the following review helpful By J. CHEN on January 29, 2011
Size Name: 45 Watt Verified Purchase
The first question in my mind is, is it truly "full spectrum" white? So I set up a very simple way to measure it. I am sure that it is not perfect by many scientists' standard. I am limited to the resources at my disposal.

Using a Da-Lite projector screen as the background and a standard desk lamp as the housing for the light source (I don't have a studio lighting setup yet), I set my Canon T2i to raw mode. Except for auto exposure, the camera does not do any auto processing including ISO. The photos are then imported into Photoshop without any kind of enhancement. The center point of the image is sampled and Photoshop can tell me the color composition of that sample.

For comparison purposes, I also measured two other light sources: Canon 430EX flash light and Feit 18W(75W equivalent) household CFL with "Daylight" color temperature. The results are color charted in Excel and uploaded to this product page above. They are surprising.

To be "full spectrum" or white (either terminology is not quite precise), the strengths of the three prime colors need to be equal. The strength is number between 0 and 255. (0,0,0) is pure black and (255,255,255) is pure white. Human eyes are usually quite tolerant of difference in the single digit range. Most people, including me, would expect the $300 Canon speed light to be a very color neutral light source. But no. It actually has a visible blue tint. It is only marginally better than the $1 Feit "Daylight" household CFL. I am not suggesting that a flash light and a CFL are interchangeable, it is nevertheless disappointing that the Canon can't get a tight color balance in that expensive device. The best one, by a significant margin, is the Cowboystudio photo CFL.
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39 of 43 people found the following review helpful By Lorax on March 1, 2011
Size Name: 45 Watt Verified Purchase
I plugged these into my kill-a-watt meter to see how much power they are using. It turns out they are only using about 23 watts, half of the rated 45 watts. By comparison another CFL I have is rated 85w and uses 70 watts. I had been wondering why the coils were physically about a third the size of the 85W bulbs, and now I know: They use about a third of the power.

The light quality is quite close to 5500k, but as with all flourescents they have a green spike that causes them to show up as just a little green when shooting on the daylight preset of a camera. I get whiter whites with the florescent preset.

Using the rule of thumb that florescent lights use about a fifth the power of tungsten, this would be about the equivalent of a 100 watt bulb. Not bad, but don't count on more light than that.
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13 of 13 people found the following review helpful By the engineer-historian on June 3, 2012
Size Name: 45 Watt Verified Purchase
I should have read the reviews before I ordered these CFLs. They certainly are large enough to be 45 watts, but as soon as I screwed one in my flood lamp and turned it on, it was obvious that it wasn't even close. After leaving the Cowboy Studio CFL on to fully warm up, I measured the power it consumed at 21 watts, less than half of what it's rated for. I also checked the light output with a light meter and found it less than another CFL I have that is rated at 23 watts and cost under a dollar at Home Depot. These CFLs are going back tomorrow, on Amazon's dime.
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19 of 21 people found the following review helpful By JW on November 7, 2010
Size Name: 45 Watt Verified Purchase
Perfectly acceptable for video uses. However...

After getting these, I realized that with a full spectrum bulb and around 12,000 lumens in a four-pack, this puts out very similar light to a official Seasonal Affective Disorder lamp, for roughly 10% of the price. We have them hanging over a desk from some cheap IKEA reflectors. Winter, begone!
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11 of 11 people found the following review helpful By D. Pray on December 5, 2011
Size Name: 45 Watt Verified Purchase
light output testing.
4 - 45watt cowboy studio 5500k CFLs (actual 22watts/ea) (suppose to be 225 watt equivlent each)
vs
1 - BCA Photo bulb 4800K 250watts (actual 245wattts)

lights 2 foot away from the subject
camera 1 ft away from subject set to f2.8

the 4 CFLs were 1/40 sec
the 1 BCA was 1/30 sec

CFL pros:
only 88 watts for 4 bulbs
long life (hopefully)

CFL cons:
more expensive than standard photo bulbs
need a 4 way adapter to use them
low light output
mercury

BCA pro:
cheap
easier to setup and use
no mercury

BCA cons:
short life
hot
uses lots of power

Even using four 45 watt (22 watt) cowboy studio bulbs is not enough to take portrait pictures. you would need many many more.

I think CFL are a great idea, but these ones are not so great. Plus there are several other issues including loose bulbs, slight cracks in the glass, and looks like some bulbs don't fully light up.
I have not tested, but wonder what the "real" CRI of these bulbs are.
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10 of 10 people found the following review helpful By Dan G. Hiris on October 15, 2011
Size Name: 45 Watt Verified Purchase
If you are looking for a 45 Watt bulb, this is not it. It actually measured at 29 watts +-1 fluctuation.

For me though it worked out well because I didn't realize when I ordered it that the socket I was going to plug it in has a Max rating of 40 Watts. That actually makes them work for me.

Brightness-wise they could be brighter but I can't complain.

Color-wise they emit a little too green for my linking but that's not too bad. Pretty easy to adjust the white balance.

EDIT: after a month of use, I am really annoyed that I have to use one stop lower than I could have used if these were true 45W. Hopefully I'll still be able to return them and get a different set.
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