Halogen lamps are manufactured with enough halogen to match the rate of 
tungsten evaporation at their design voltage. Increasing the applied 
voltage increases the rate of evaporation, so at some point there may be 
insufficient halogen and the lamp goes black. Over-voltage operation is 
not generally recommended. With a reduced voltage the evaporation is 
lower and there may be too much halogen, which can lead to abnormal 
failure. At much lower voltages, the bulb temperature may be too low to 
support the halogen cycle, but by this time the evaporation rate is too 
low for the bulb to blacken significantly. There are many situations 
where halogen lamps are dimmed successfully. However, lamp life may not 
be extended as much as predicted. The life span on dimming depends on 
lamp construction, the halogen additive used and whether dimming is 
normally expected for this type.

http://en.wikipedia.org/wiki/Halogen_lamp

panašu, kad geriausia palikt 100%....

On 2012.07.27 09:50, wiedras wrote:
> o kodėl ?
>
> "Dainiushas" <skirdain@gmail.com> wrote in message
> news:jutcp7$53v$1@trimpas.omnitel.net...
>> 80 bus įtariu blogai. Bandyt kokia 50-60 jei šviesos pakaks
>>
>