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Blister greater the smaller lumen, ie evaporation and deposition of tungsten light output is proportional to the block. As part of the inflatable bulb to prevent the evaporation of tungsten is smaller so the light fades. If it is the same incandescent filament, made in different size bubble shell, relatively the same time bad light indeed smaller than the large bubble shell bubble shell small. In addition you say outside the bubble is also a large inflatable space within the glass bulb, gas for heat flow to a relatively large glass area, a relatively small light bulb is much lower temperatures, the temperature of the filament is relatively low, the luminous efficiency low, tungsten evaporation rate is low, so the light fades to be small. But the same filament light bulb efficiency in large than small filament bulb is much lower. So when the filament is designed to separate the design, production, comparable in reality meaningless. N-hour light failure = 1 - (N-hour flux / 0 hours of luminous flux)

Lumen is the units of luminous flux. Luminous intensity of 1 candela (cd) of the point source, in the unit solid angle (one steradian) emitted luminous flux within the "1 lm" abbreviation (lm). Name Definition The so-called lumen simple terms, this means the candle a candle in one meter outside the brightness of the show as a normal 40-watt incandescent bulbs, the luminous efficiency is about 10 lumens per watt, so you can send 400 lumens of light. 220-volt 40-watt incandescent lamp, the luminous flux of 340 lumens. Flux per unit time is to describe the visual response to light radiation capacity of the strength of the unit is the lumen, also called brightness. Projector unit that is ANSI lumens luminous flux, ANSI lumens is the American National Standards Institute to develop standards for measuring luminous flux projector, it measures the screen, "field"-shaped intersection of nine points on the illumination, multiplied by the area, and then find nine point average, is the projector's ANSI lumens. The higher the lumens the brighter, the higher the brightness is not required when the projector lights. ANSI as American National Standards Institute (American National Standards Institute) abbreviation.

We can provide more details on led downlight, led strip light ans so on. I think this website may help you: www.chylighting.com

Yes, i agree with you. www.chylighting.com

１.you need to know what kind of led light　you want?led spot light,led down light, led bulb led PLC light? ２.the usually led on the market are: CREE/Edison/Epistar. 3.The usual warranty the supplier provide is two years. ４.You can find good quality and also bad quality in　China. This depend on how much you pay.

Yes, it's a good idea. If buy together, you can save a lot. $140 for full stainless steel LED downlights.--------This is really very high.