Dimmer support for dimmable LEDs

Hi

With regards to some dimmable led's we have, would you think the dimmer will support them ok before I start changing them over !?

http://www.dotlight.de/datasheets/5W_MR16.pdf

 

Yes... efficiency of LEDs is not as good as some people think.

LED as linked above
120 lumens @ 6W = 20 lm/W

240V GU10 (and G9) Halogen
820 lm @ 60W = 13.66 lm/W

Normal 12V 50W Halogen + Electr Trans
910 lm @ 54W = 16.85 lm/W

IRC 12V 35W Halogen + Electr Trans
900 lm @ 39W = 23.07 lm/W

IRC 12V 50W Halogen + Electr Trans
1250 lm @ 54W = 23.15 lm/W

 

probably the best value at the moment is :

2 x IRC 12V 35W Halogen + 1 x Electr Trans
1800 lm @ 74W = 24.32 lm/W

 

As I understand it, the halogens also run longer when operated at 80%-90% of full power and provide only 10%-5% less light.

 

At 95% you will double the life of the lamp.

At 90% you will quadruple the life of the lamp.

 

With incandescents (which includes halogen), the general rule is 5% dimming = doubles the life

But the light output drops off alarmingly

****************

Here's some techy stuff from http://en.wikipedia.org/wiki/Incandescent_light_bulb :

Incandescent lamps are very sensitive to changes in the supply voltage. These characteristics are of great practical and economic importance. For a supply voltage V :

Light output is approximately proportional to V ^ 3.4
Power consumption is approximately proportional to V ^ 1.6
Lifetime is approximately inversely proportional to V ^ 16
Color temperature is approximately proportional to V ^ 0.42

where the ^ symbol means "to the power of"

This means that a 5% reduction in operating voltage will more than double the life of the bulb, at the expense of reducing its light output by about 20%. This may be a very acceptable trade off for a light bulb that is a difficult-to-access location (for example, traffic lights or fixtures hung from high ceilings). So-called "long-life" bulbs are simply bulbs that take advantage of this trade off.

According to the relationships above (which are probably not accurate for such extreme departures from nominal ratings), operating a 100-watt, 1000-hour, 1700-lumen bulb at half voltage would extend its life to about 65,000,000 hours or over 7000 years ? while reducing light output to 160 lumens, about the equivalent of a normal 15 watt bulb

 

I wonder has anyone any experience with these?

http://www.led1.de/shop/product_inf...0-p-727&cName=highpower-p4xre-led-spots-c-168

Power: 230V (AC)
Color: warm white (3200K)
LED: Cree XR-E
Brightness: 2500 lx (50 cm)
Beam angle: 38?
3 Watts

I also expect that they cannot be dimmed.

thanks
Damian