If you turn on 2 bulbs of T12 5000K at the same time,Is that means 10000K?
1437035
Not necessarily. If the two bulbs are close together, the light will be brighter but not necessarily "double" the output of one bulb, because there is some cancellation involved due to proximity. Separate the bulbs some distance and there will be more light in the area being illuminated but the illumination will not be the same as if you used one 10000k bulb. There are formulas to determine this but I am not up on them.
1437036
"K" is color temperature, in Kelvins. 2700K is a "warm" (aka: closer to orange/red) color, 5000K is a cooler (more blue'ish) white. But the 900-series phosphors in this and other similar bulbs are intended to produce more accurate colors (light produced covers more of the spectrum), but they're less bright as a result.
1437037
"k" is the color temp, has nothing to do with lumens or light output. the color will not change with added lights
2275982
I was the one who called them, no, it is 4150K, not 4300, based on the marked part number of the bulb I received direct from Amazon, which was 66144, you can also find it in the specification sheets for that part number marked on the bulb at Sylvania's website.
1877655
I think it means R39 OR R12. If you Google for either of those, not both at the same time, you'll find loads of bulbs that look sort of right though you'll want to compare closely. Or you might find it at the local hardware store.
2253739
I have it connected to 2 T12 bulbs. That's what the electricians had in my new house and I had if replaced recently. It lasted 4 years.
200670
Usually a regular ram does have 1 bulb, but tgis one comes with both. Yes, you could convert it, but one of the bulbs will not work. You will have the high lights on all of the time if I am not wrong. The best thing just would be to return your lights.
679502
It depends on how the electrician sets it up. Ours has two switches - one that turns on one of the bulbs and one that turns on the exhaust fan with the other bulb.
839787
I assume you mean the T10 bulbs. This fixture wasn't designed for them better to buy a regular bulb with the fixture. Only a few bucks for the bulb.
2135440
As I understand it, the 6400K T-5 bulbs produce a bluer color spectrum similar to the sun, high in the sky during the longest days of summer while the other, lower numbers produce more reds like those when the sun is lower on the horizon and has more atmosphere to get through. The T-5 part indicates that they put out more light than T-12 or T-8 bulbs. For, say, tomatoes, they put on the most stem and leaf growth during the long and hot summer days but once the days get shorter, they sense the end is near and put their energy into reproducing - in this case, producing flowers and ripening fruit.Hope this helps.Paul As I understand it, the 6400K T-5 bulbs produce a bluer color spectrum similar to the sun, high in the sky during the longest days of summer while the other, lower numbers produce more reds like those when the sun is lower on the horizon and has more atmosphere to get through. The T-5 part indicates that they put out more light than T-12 or T-8 bulbs. For, say, tomatoes, they put on the most stem and leaf growth during the long and hot summer days but once the days get shorter, they sense the end is near and put their energy into reproducing - in this case, producing flowers and ripening... » Read More As I understand it, the 6400K T-5 bulbs produce a bluer color spectrum similar to the sun, high in the sky during the longest days of summer while the other, lower numbers produce more reds like those when the sun is lower on the horizon and has more atmosphere to get through. The T-5 part indicates that they put out more light than T-12 or T-8 bulbs. For, say, tomatoes, they put on the most stem and leaf growth during the long and hot summer days but once the days get shorter, they sense the end is near and put their energy into reproducing - in this case, producing flowers and ripening fruit.Hope this helps.Paul « Show Less
1219223
Yes. I have 4100k, (natural white) 5500k (day white), 6500k (bright white), and 7500k (cool white) light boards. I also have a mixed 3200 and 4100k led on the same light board which is a very bright, but not too warm or not too cool solution.
956265
Yes, T10 has the same socket like 921, mine are actually 921 and i installed it, the difference between this T10 and 921 it the bulb size
1474631
i don't think they are the same size bulbs, plus even at 50% (the lowest setting on the balast) your looking at running at 500 watts.
2224570
It powers both bulbs. If you want one for low and high beam you have to buy two.
363655
Yes....first it was one, now it's two. Love the cube and it's on all the time. But wish I could fix these bulbs
1812980
My understanding is you should have gotten 5 bulbs.2 for overhead console,2 for tag and 1 for your overhead light.
850233
From memory, I think it is 2. Had the product for a long time and never had to change the bulb so far. It has now been running every night for the last 1.5 years. Great efficiency.
1764232
To my knowledge, it is 4200 K with a light output of 3350 +/- 300 lumens. Higher temperatures do not mean brighter bulbs. Higher temperature bulbs put out less light.
1240112
Yes, you get the both pair and bulbs too! I thought they were pretty bright and did very well. Would buy again.