With all the hue & cry about "reflectivity" and "white/silver bases", the advent of the use of true Mirrors has been overlooked.
Light Fusion was always a very special application, and when combined with any darker hued Contrast Enhancing paint that is sprayed on.....it's always going to top out above a purely painted endeavor.
The larger Mirrors (5' x 8'+) have become almost non-existant due to a merger between the two largest Mfg of such, with the current entity opting not to produce them except on custom orders.
However 8' x 4' Plastic Mirrors are still available for under $100, and so being they are directly in line with the cost of the same size Wilson Art DW sheet. But DW can never deliver Light Fusion's performance.....there is just no possible way. Mind you it does as good as possible...the best of any pure White unpainted surface to date, but there it maintains a steady position, allowing only for the performance of a PJ itself to dictate how good the image will be. And quite honestly, any High Contrast PJ shooting onto a pure White surface WILL lose a degree of it's contrast. Start out with a native 30k:1 CR and the loss will be miniscule enough to not warrant concern. But under 6k native CR? No help asfar as maintaining CR will be / can be forthcoming.
But nothing short of a stretched Mylar sheeting can equal a 2nd Surface Plastic Mirror's reflectivity, and unless Mylar is set "behind" a clear plastic sheet, even it cannot provide the "Light Fusion" principal.
A dark hued coating over a mirror.
All light darker than the lightest shades is reflected back.
All intenesely lighter shades with enough photonic energy to penetrate the Top Coat reflect off the Mirror and rebound to enhance the lighter elements of the image "only".
Earlier Light Fusion examples suffered from only one performance caveat......less than desired Contrast due to the overall increase in equalized screen gain. When MMud-SE (Silver Edition) was introduced to Light Fusion, all that changed, Contrast was no longer left wanting..., and the surge toward true Ambient Light performance was instigated.
I myself was...and still am interested in "mirrorless" applications. I'm no fan of spending any more than is necessary to acheive exlemplary results. But the present fixation on having the absolute best possible Contrast AND sterling White
levels requires a revisitation to the Light Fusion princibles.
In DIY there will always be "Good-Better-Best-....and OMG!"
A well done, sprayed Light Fusion using a correctly assembled CR Enhancing mix fits squarely into the latter category. S-I-L-V-E-R for a Dark room is stupendous....if you can spray. Silver Fire...and to a slightly lessor extent the simpler Black Widow can provide excellent Ambient Light performance, but both to at least some degree attenuate Whites while managing to provide the apprearence of enhanced Contrast.
Both SF & BW can strive to do more when combined with a Mirror to produce "Light Fusion". SF has already "Been There...Done That" That is a "given". What might Black Widow...or any neutral Gray for that matter.... acheive via Light Fusion? Indeed?
Are there any Brave Souls who would care to find out?