BPL上看来的，关于蓬松度和保暖性能。
Richard同志的贴。300g of 800 fill power in a quilt provides an average clo of 6.46 and an EN13537 LLimit temp rating of 24.2F. For every 50 fill power difference the same amount of down provides approximately .1 clo difference in warmth which equates to approximately 1.01 F difference in a LLimit rating. So, the same amount of filling in 850 fill power quilt versus a 700 fill power quilt will be accurately rated about 3F different.
There are a number of separate studies that I combined to answer the question. None of which are related to thermal conductivity vs down density. The study that was most relevant was a private study paid for by a group of manufacturers for their personal use.
Five mummy bags were made exactly alike by the manufacturers and filled with 0.624 kg (22 oz.) of down. The only difference between the bags was the fill power of the down which ranged from 600 to 800 in.3/oz. in intervals of 50 in.3/oz. An EN 13537 certified lab was paid by the manufacturers to test the insulation value of each bag. The data showed that the bag insulation increased systematically with the fill power of the down in the bags. The bag insulation value increased about 0.1 clo for every 50 in.3/oz. increase in fill power.
source：http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=33188
下面回帖也有很多争论，供参考吧。
如果Richard引的数据靠谱，那700fill是不错的平衡点啊，多充一点就行了。。。
翻译一下大意：
某厂家付费委托某测试机构测试后其提供的样品得到的结果：同等重量的绒，fp(蓬松度)每高50，clo值提高约1华氏度。
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“多充一点就行了”，说得多余了，650fp也是再充一点就行了啊……
700fp在性能价格比上比较划算，我基本同意。
以高价购买高fp值不值得，国内外都讨论过好多次了，这话题endless.
（插一句，商家标的蓬松度和含绒比，尤其是国内，能信么……） 同fp的绒也会摸起来不同 比如wm的800f和golite的800f就明显不同 可能一样蓬 但是抗压的表现完全不同 羽绒制品里边有很多厂商不会宣传的隐性指标。羽绒的保暖度其实最终取决于绒芯的结构，这个也是为什么蓬松度一样羽绒手感会不一样的原因：绒芯越饱满的羽绒，相应的保暖性也就更高，手感更为充实（越接近棉睡袋的手感），而要获得这种绒的饲养周期也会更长。 看了楼上几位说的才恍然大悟，为什么看起来都很饱满的羽绒睡袋，摸起来感觉却大不相同。 光有蓬松度和支撑力还不够，那个著名品牌的900蓬羽绒服宣传的就是蓬松度，大家注意看它的成分标了吗？含绒量目前都是75%，没多少保温性的毛片占了25%，这也是水电不太喜欢蓬松度这个指标的原因之一。要保证保暖度，一是含绒量要高，最好能达到95%，另外蓬松度要在800以上，这两个条件都具备了（这个很难！），往往绒朵形态才会好，手感也不会差到哪里去。 长知识。
之前对比某总的720FP和某石的750FP，感觉某总的手感更充实。 羽毛和羽绒，差一字差千里····· 长见识了！！！
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