Rated 2.5 out of 5 by 2
Rated 4 out of 5 by amalak Dimming isn't perfect, but good value anyway
Dimmable CFLs are questionable technology, which I knew going in to this purchase, but overall, I think this TruDim bulb is pretty OK. The 3500K color is spot-on and the dimming is acceptable. I noticed a slight buzz coming from the bulb, but honestly, I've heard similar sounds from Halogens. Good value for niche uses.
June 29, 2012
Rated 1 out of 5 by jrista Dimming not smooth, LOUD buzz!
These bulbs are horrid. I recently purchased seven of them for a fixture in my dining room. The do not meet a single one of their advertised traits. These bulbs are advertised as "smoothly dimming" from "2% to 100%", as well as compatible with "standard 600w wall dimmers". All statements are completely false. Even after following the instructions on the box which requires a two-hour burn-in period, these bulbs are the worst performing bulbs I have ever used. For one, they are most assuredly NOT compatible with standard 600w wall dimmers. I tried the original dimmer in my wall, which is a number of years old. The bulbs would flicker and jump around in brightness from their dimmest level to just below 100%. They only functioned well at exactly maximum power. I replaced the "old" wall dimmer with a new one, however I experienced exactly the same problems. I returned the new standard wall dimmer and purchased an LED/CFL compatible HED wall dimmer, and the results were better, but far from ideal and not even close to advertised. The bulbs still did not dim up and down smoothly...there were several areas of clear brightness jumps. The bulbs also stopped dimming around 30%, below which they would start flickering, pulsing and popping. According to TCP, this behavior is "normal", and a "safety mechanism" built into the bulbs. Ok, great, but 30% is a FAR CRY from 2%, and the bulbs still don't dim smoothly even with an HED certified wall dimmer. On top of all this, these bulbs had two other problems. First, while most CFL bulbs have a slight green or magenta hue, these bulbs had a pretty strong magenta hue. Most CFL bulbs also assert their labeled color temperature better once they have been on for a while, these bulbs appeared magenta all the time. The worst problem of all, however, was an extremely LOUD electronic buzz. This buzz was always present, regardless of dimmer or brightness level. It increased considerably in loudness the moment you started dimming from 100%. Color casts I could deal with, but a constant electronic buzz is just plain and simply unacceptable.
I have some other TCP dimmable bulbs (my only others) that behave pretty well, dim smoothly from around 10% to 100% with only one slight jump in brightness, and no audible buzz. I must have received a special batch, as my experience with other TCP branded bulbs has been horrible. I do not recommend these bulbs to anyone. I highly recommend researching dimmable bulbs for ones that behave better and are more compatible with standard wall dimmers. Despite their cost, I recommend looking into LED bulbs, as they seem to offer far more consistent color and smooth, consistent dimming.
June 24, 2012