Light Shades

[stevec]

(11-13-2013, 12:20 PM)awemawson Wrote: You could of course just mount a pointed bar vertical in the bench vice, and balance the bowl on it itteratively moving it to get it right .

Andrew

I like Andrews Idea. and once it's balanced whack it with a wooden mallet or the like and there's the centre punch mark.

[TomG]

They look good Greg, how do they reflect, not being white?

[stevec]

Tom, how does a mirror reflect, not being white?

[f350ca]

I'm guessing they're reflecting the light, you can feel the heat below the bulb, after a few minutes the shade is warm but not hot, must be reflecting rather than absorbing the energy.
A little surprised at the light output though, it appears yellow rather than bright white.

[TomG]

Steve,

Most reflectors you see are white, probably to diffuse the light. A mirrored surface can reflect an image, such as the element in the bulb.

Greg,

Maybe a frosted bulb would help with the color.

Tom

[f350ca]

(11-13-2013, 09:09 PM)TomG Wrote: Steve,


Greg,

Maybe a frosted bulb would help with the color.

Tom

Sure now you tell me after I bought 8 clear ones.

[awemawson]

I suspect that most reflectors are white as it is cheaper to spray them white than chrome plate them. The reflectors in car head lamps are all silvered or some modern metallised equivalent.

[DaveH]

Here is a chart.
   

DaveH

[stevec]

But Dave, it doesn't show the reflectivity of white or gloss white.

[DaveH]

Steve,
White paint is around 85% (that's about as good as it gets) Aluminium, stainless steel +95%

DaveH