ALZO 27W Joyous Light® Full Spectrum CFL Light Bulb 5500K, 1300 Lumens, 120V

I often don't get as much sunlight as I should due to screwy sleep patterns. Full-spectrum lights are very helpful in this regard, so I can get "sunlight" even in the middle of the night.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.

They are long-lasting full-spectrum bulbs, which is what the experts say is important for winter months of long, dreary days. I've been using them in all of my lamps and overhead fixtures for years.

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).

At first this was a shocking adjustment (pardon the pun) but after a few minutes, I got used to how brilliantly daylight bright it was and started to love it. The light is clean and clear, unlike the yellowish light you get off "soft-white" bulbs, and even though I keep overusing the word, it makes every room REALLY BRIGHT. As someone who suffers from Seasonal Affective Disorder, this was FANTASTIC for me, because being in a room that's sort of dingy or dimly lit for hours at night is really depressing. These bulbs really help with that.Keep in mind, though, that these bulbs are physically quite a bit larger than regular light bulbs. They likely will poke out of your light fixtures. Think about that if it is an issue for you (it's not for me - I don't care as long as there's light). However it DOES mean that they will not be suitable for some lamps because of the shape of the lampshades.

the lamp has a nice light.all good except it failed in a few months without barely any use.actually, the return date expired just 2 weeks before it blew up... (planned obsolescence????)now the detail of saying that it lasts 10000 hours upright and with ventilation seems like an essential thing for this lamp to last! I hope thats the reason. Cause i didnt have it upright all the time and of course i have a short cover to not stare directly into the light!disappointing...

I had wanted the 15 watt. But they were sold out with utterly no idea when they would be back in. These are too large to fit 75% of the lamps I wanted them for, and expensive to boot. They do give a wonderfully lovely brilliant, sun-like light, but I do wish I could return half of them. The 15 watt version became available literally the day after I received them, and I feel a bit stupid, now. The shipping may not make it worth it. The bulbs are insanely bright and provide amazing light, but despite the standard socket size, the 9" length of them makes them just too big to use in the majority of cases.