nu blyn wrote:
> Kiek standartines masinos lempos skleidzia lumenu ? Palyginimui butu tarkim 
> pruzikas is dealextremo nusipirkau 180lumenu .... sviechia puikiai jis ir 
> nebetoli masinos lempu sviesai, Yra pruziku po 700 lumenu, kaip isivaizduoti 
> kiek sviechia jie ? Biski brangu pirkti neisivaizduojant koks ju galingumas, 
> su kuo palygint ? 

Beam Peak Intensity Reference Number

This marking is found only on ECE/EEC type approved forward lighting 
devices that produce a high ("upper", "driving") beam, and expresses the 
maximum light intensity in the beam. This marking is NOT an indicator of 
lamp performance or quality. It does not indicate where in the beam this 
maximum occurs, nor does it imply anything about the shape of the beam. 
The marking is a number such as 10, 12.5, 17.5, 20, 25, 27.5, 30, etc. 
Maximum authorized total high-beam peak intensity per a vehicle under 
ECE regulations is 225,000 candela at 12 Volts, and many countries that 
adhere to ECE or EEC regulations use this marking to determine the 
lighting legality of vehicles in use. 225,000 candela corresponds to a 
peak beam intensity reference number total of 75, so many countries 
stipulate that all beam peak intensity reference numbers found on all 
devices on a single vehicle must total up to no more than 75.

To learn the peak beam candlepower of a lamp with a standard-wattage 
bulb operating at 12 Volts, divide the reference number on the lamp by 
37.5, then multiply the result by 112,500. But remember, a lamp with a 
higher reference number is not necessarily a better lamp than one with a 
lower number.