Originally Posted by Lorddeff07
I think I am in love with the silverFire screens. They haunt my sleep now... dunno if that makes sense. But MM, would like to ask. So I have seen how a SF2.5 8.0 looks like from some shots PB put. And I recall you saying that when going darker than 7.0 or so you compensate by increasing the amount of UPW in the mix.And you keep saying once I go over 8.0 diminishing returns start to kick in. Can you tell me exactly what goes wrong if I make a hypothetical SFv2.5 10.0 mix.
After a point, more surface reflectivity is lost (-Gain = less foot lambert ) so one must compensate with more lumen output.
And what would you say is the estimated gain in say an 8.0 mix and what do you think it would be in a 10.0/12.0 mix.
0.9 & 0.8 respectively, although those figures are deceptive in as much as the retention of White & Colors makes the screen look like a positive gain surface.
And what are the benefits of using a mirror as my 1st surface? I am thinking more along the lines of Silver acrylic/perspex mirror
. In thickness of 6mm. I want to use it to replace using a sintra completely. I linked you to its page.
The epitome of DIY Screen performance.
Not only does Light Fusion still reside at/on the pinnacle of DIY screen-dom, it is the only real way to mitigate the effects of attenuation that a truly dark SF
mix will introduce.
You've hit upon your best solution...in fact, the darkest SF
screens I've made all employed 6mm Plastic "2nd Surface" Mirrors. (...not 1st Surface, they have less effect because they require more surface masking...)
Hitting even closer to home, I have done a few large Screens in London for Rugby and Soccer Club Clubhouses (...a coy name for after-hours Player's Pub
) and I am even familiar with the Jobber who you linked to. (...although they only sell in 3mm thickness and haul up shot at only 79" in length. Sadly, we here in the States cannot get Acrylic Mirrors in sizes above 2438 mm x 1219 mm ( 8' x 4' )
Here is a older link to a Thread involving one of those builds:
I'll puta "Real Bug" in your Ear. Ambient AND Direct light performance is possible.
The screen involved was only a older 130" SFv1.0 2.0
being hit with a Optoma 1691 so it in no way does it represent the potential involved in using a darker SF paint.
Light fusion collects the light that passes through the top coating and reintroduces it into the surface. A Mirror attenuates light it reflects, as does the passage through the paint, so the reflected, reintroduced light does not cause any adverse hot spotting (...if there is a properly applied thickness of SF
The darker the SF
coating is the easier it is to cover the Mirror in fewer coats. Applying the SF
in Duster Coat fashion is essential of course. And you really want to use 3 mm thickness if at all possible, and apply it to a flat surface using the suggested Mirror adhesive spread thinly.
The Light Fusion application has a UK Patent BTW, and was quite popular across the Pond (circa 2009/2010) until a concerted effort by a few crossed-over US individuals on the AVF Forum made it their specific goal to have it be dismissed as being ineffectual at best and misleading at worst. (...but not so strangely they never could accomplish anything near the same results, so....
Stay in close touch so I / we can collaborate on your effort. I dearly miss there not being more Light Fusion projects, but most do not want to have their screen size restricted to at / under 98" diagonal.