Buy Cowboystudio Full Spectrum Light Lighting Bulb- Four 85 watt Photography Photo CFL 5500K - Daylight Balanced Pure White Light 4000 LumensCowboystudio Full Spectrum Light Lighting Bulb- Four 85 watt Photography Photo CFL 5500K - Daylight Balanced Pure White Light 4000 Lumens Product Description:
- Four (4) Daylight 85 Watt fluorescent light bulb
Product Description
Compact fluorescent light bulbs use up to 75% less energy and last up to 10 times longer than standard light bulbs. The total cost of ownership of a compact fluorescent light bulb is typically substantially less than a standard light bulb that produces the same amount of light. Primary applications for compact fluorescent light bulbs include retail, hospitals, warehouses, workshops, churches, arena, schools, television, photography, and garages. 5000k daylight compact fluorescent standard spiral bulbs are an excellent choice for digital camera photography. They generate a close match to natural daylight and a crisper view of the items being illuminated.
Average Life: 8,000 Hours;
Approximate Incandescent Equivalent: 300 Watts;
Save 215 Watt in Energy;
Flicker-Free;
E26 standard screw-in base;
CRI (Color Rendering Index) > 84;
Designed for 120V/60 HZ;
Bulb size: 9" Tall x 2 3/4" Wide Do not use with timers, dimmers, or exposed to the weather.
Customer Reviews
Most helpful customer reviews
35 of 37 people found the following review helpful.
Fantastically White (with this little green you pay for it)
By J. CHEN
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. It is amazing that a cheap CFL like this can produce such tint-less light. The difference among the three colors are less than 5 percent, and not visible to me (and probably to most people). I'd conclude that it does live up to its claim of being a "full spectrum photo light."One thing that puzzles me is that when I looked at the exposure data, I found that the aperture and shutter combinations used for 45W and 18W CFLs photos are almost the same (the distance to the screen is the same). I had expected at least one stop difference. That might be due to the fact that the 45W CFL is so big and long, the shade of the lamp can't reflect well. But I am not quite sure.
24 of 27 people found the following review helpful.
Literally overrated: 23 watts instead of 45 as rated.
By Lorax
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.
15 of 17 people found the following review helpful.
Poor man's SAD lamp
By JW
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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