They produce close to same quality of light as the halogens. The boxes they arrive in say they replace a 100w bulb and that is pretty close i.e. they appear to be a bit brighter than the 90w halogen. The light is bit more white than a halogen but close enough that you can't really notice the difference.
The product description says they are instant on. This is not actually true. They take about a 1/2 second to come on after you flip the switch. They come on at about 50% of their total output and it takes them about a minute to fully warm up and get to full capacity.
They are about a 1/2 inch longer than a par38 halogen, 5" vs. 5 1/2", but they fit fine in the cans.
The product description says 10,000 hours of life, but on the box it says they are spec'ed to last 8,000 hours. Clearly I have not had them long enough to say if this is true or not.
Given all the above (why I gave them 4 instead 5 stars), especially the non-instant on, means they are not a perfect replacement for the halogens, but given I replaced 40 90w halogens with these, effectively saving me over 2600 watts, I am willing to live with the slight differences to reap the energy savings.
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I bought these to replace par30 75w halogen bulbs that I have in many places of my 1980's built house. The can lights that I used these in are the fisheye adjustable type that was used heavily in the '80s. These work just fine in those type of cans.The light output of these is very comparable to the 75w par30 halogen floods. The brightness is roughly the same these might be a little brighter but hard to notice the difference. These are also a little bit sharper in light, i.e. more of a silver than the yellow of a soft white halogen but pretty close.
They do come on instantly but take roughly a minute to fully warm up and come up to full light. The result is they will look like you have dimmed them to about 50% when you first turn them on cold and then they will get to full output in about a minute.
They are longer than the par30 halogens. If you look at the picture of the bulb on this page, the normal halogen when placed side by side will only extend down to bottom of the white ceramic part of this bulb. So these bulbs are about 2" longer than the standard par30 halogen. This was fine for my application as I had the room in the can for them but they might be too long for some applications.
All in all, I am happy with them as I replaced 40, yes 40, bulbs in my house with these, therefore the savings in wattage will be significant enough to put up with the slight differences from the halogens.
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I have tried many different Par30 CFLs over the years and none were acceptable until I tried this one. We have white cabinets and we like to keep these lights on 17 hours a day and my wife is VERY particular as to the color cast. All other bulbs were either not bright enough or too blue or too green. This is the only bulb I have been able to find ANYWHERE that my wife will allow me to use in our overhead kitchen recessed lighting fixtures. Yes, it may take a little time for the bulb to reach full brightness, but so do most CFLs and since we keep it on, that is not a huge issue (tho they do seem to take longer than other CFLs I have used).
It could stand to be brighter. I cannot tell, but the wife says they are not as bright as the 75 watt halogen bulbs were.
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Product looks fine and probably is good quality, but it does not have a long enough base to reach the socket for a standard outdoor floodlight fixture. PAR38 FLOODLIGHT CFL COMPACT FLUORESCENT LIGHT BULB 23 WATTS ENERGY STAR 27K WARM COLOR TONE INDOOR-OUTDOOR FLOODLIGHT REPLACES INCANDESCENT AND HALOGEN BULBSFind helpful customer reviews and review ratings for PAR38 FLOODLIGHT CFL COMPACT FLUORESCENT LIGHT BULB 23 WATTS ENERGY
Last fall I replaced all exterior flood lights with the CFL replacement. They worked great until the weather turned cold. They took at least 5 miniutes to come up to about 75% of full briteness. That was when the temp was around 35 degrees. I pulled them out and installed the old bulbs. Living in New England using exterior CFL bulbs is not a good mix!
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