1. lm / watt.
e.g. If the light bulb label is 250lm 5.5W, you can make a simple calculation, around 45lm / watt of this LED.
This is a single dice LED package inside this light bulb.
I found one LED brand in this exhibition, 160lm / watt. (Overdrive 760 lm / watt). You may found this product at the end of 2010.
2. CRI factor (Color reflection index)
Sun light is 100% reference.
This light bulb only claim 75.
What happen is?
Try to use LED lamp bulb project to the "Fruit", you will know what I say.......
100% CRI will result more nature, just like what you see what you get.
75% CRI......... I think you will not interest to buy the "fruit" if you watch that.
Today LED lamp efficiency is same as T5 fluorescent or a bit higher, also using switching
mode power supply technology, no good for Hi Fi. Tungsten bulb or halogen bulb are good, they are not
using switching power supply.
They using direct ac or step down by transformer for 12v lamp, do not buy switching dome step down type
(電子火牛).