The 5500K ALZO bulbs are the closest thing I've found to actual sunlight. My basic test is just to compare the color to natural sunlight through a window on a sunny day. The color these bulbs put out is quite close to that. I've also tried some photographic tests and these bulbs produce the best results of various full-spectrum bulbs I've tried. Many bulbs have a yellow or blue tinge to them (the latter being especially annoying), but these do not!
If you're not used to full-spectrum bulbs, you may find the light to look excessively cold and sterile at first. But colors look more vivid and natural once you're used to the pure white from this bulb, and regular bulbs seem a sickly yellow in comparison. I'd recommend giving it a couple weeks to get used to this bulb if you don't like the color at first; it may just grow on you! (I initially only put full-spectrum bulbs in a couple places, such as at my desk, since they did seem "too white," but I've started installing them elsewhere in my house now.)
I have both 27W and 45W ALZO bulbs, and the color looks the same between the two. Keep in mind that even the 27W ones are quite long (6.5") and will not fit into many fixtures; the listed dimensions are accurate, so measure accordingly. The size is the one big downside with these bulbs; it'd be nice if ALZO had a smaller 20 23W version. These bulbs also seem to buzz more than some CFLs, and I found this to be more the case in certain sockets for some reason (possibly old wiring and not the bulbs.)
Note that this is the single-unit version of ALZO 27W Compact Fluorescent Case of 4 Daylight Balanced 5500K Pure White Light. The model numbers differ slightly, but the bulbs look physically identical, and the light output and color were indistinguishable when I put the two side by side. The "Joyous Light" rebranding sounds weird to me too; it's kind of a cheap-sounding name for such an awesome bulb! :) But these are the same good old ALZO bulbs, just with a different name.
In short, these are about the best thing you'll find if you need artificial sunlight indoors for whatever reason: sleep problems, mood disorders, photography, or just a preference for pure white light.
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I've avoided buying CFL's because the quality of light is almost always terrible. For awhile, I've wanted to try a high CRI (color rendition index) CFL. The only problem is I have yet to see any for purchase locally. I finally decided to buy this one online as a trial (Free shipping is compelling.).The light is interesting. Two factors contribute to this. One, the color temperature is higher than a incandescent bulb. The 5500K temperature tends to make everything a bit bluer. Two, this CFL has a CRI of 91. While CRI is an old and imperfect metric, it roughly guides how true colors appear. These two factors combined make for seemingly whiter light -something better understood once you become accustomed to light without that incandescent yellow glow.
Florescent light still feels different -more diffuse, brighter, and clinical; or something like that. I'm not sure if I like it. But, if you want to try a CFL that puts out a less weird cast of color, try this one.
Also be aware, people with sensitive hearing and/or quiet rooms will be able to hear a soft hum from the bulb. The bulb is big, as well. Definitely, look at the drawing with dimensions (one of the product pictures above).
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After reading the reviews on this and other full spectrum lights by the same manufacturer I purchased this one to use at my desk at work. I have the bulb installed in a small lamp with a white cylindrical shade. The light was great for a while, but over the course of about three months has dimmed to the point that it is unusable. It barely even lights up the shade on the lamp anymore, and almost no light reaches the desk even directly below the lamp where it doesn't have to pass through the shade. The light is on for nine to ten hours per day on weekdays. I'm sorry, but $6 for a 600 hour bulb is unacceptable.Honest reviews on Alzo Joyous Light 27 watt CFL Full Spectrum Photo Light Bulb
This bulb provides good light, but it makes a loud buzzing sound. I ordered a couple of these, and they both do the same thing.Find helpful customer reviews and review ratings for Alzo Joyous Light 27 watt CFL Full Spectrum Photo Light Bulb
Buying these to flood the home office to prevent SADD. Good price. Only negative quality is their inability to withstand a four-year-old knocking the lamp on the floor.
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