That will not reveal holes that are in the beam cast, or where there is too much leakage above the vertical cut-off in low beam.If you project the headlights (either together or one at a time) against a plain wall (ideally painted white) or garage door from about 25 feet in low beam and at about 50 feet in high beam, that will show where there is beam being cast and where there isn't.
Well, your show on the wall deal sucks (with LED), sorry to say. With LED, it will look so intense on a wall you will get all giddy with excitement and then bamm!... Outside on absorbing elements, keyword is absorbed (or whatever word you wish to insert). So the best way to actually see how this 6K light color emitting from diodes is really "lighting" is how I mentioned above^
On a white wall, you can see the variance of brighter to dimmer (patches) or areas as you mention as "holes". Agree w this totally, but, this test fails with the above paragraph. It's weird and baffling, but I now have come to know all this through (probably way too much) T&E.
Here's the skinny folks, and this coming from a guy who is now on his
8th pair of LED's (retrofitting wise). The luminance is different from how we know it (with LED's), and yes, they're some very bright one's now out there, BUT, the dual brightness ones done with a shield (to shift the HB to the lower part of the reflector) SUCKS!! All of them. Period, at least to date. I've tried 4 different one's (H4 in my snowmobiles this winter)...sucks!! They look intense (looking at them), but no projection luminance.
The #1 problem (and this is now the sole problem) is that this immense light source is not coming from the same height/distance away from the reflector as what the reflector was built for.
Here is one of my accepted LED retrofits (on my K16), but it is a Hi-Beam only retrofit, so this is much easier than H/L as I have only 1 beam to adjust the reflector for.
40watt 3600lm (ea) on the right, halogen on left. Picture doesn't really do it justice on the difference FYI. I'm waiting for better weather for my road tests to begin, but in the garage and against the wall, they are simply awesome.
Now look at the LED fitted, you will see where the diodes are, quite far away from the reflector...
The result from the diodes being father out/away from the reflector?... wider pattern. The halogen is (was) very close in, which projects an almost "follow-spot" beam outward,but not much in the means of spreading the light sideways (you know, the deer running at you out of a culvert). So easy fix? No. You can adjust the reflector quite easily in my case b/c it won't effect my HID low beam. However, I can not adjust the beam. What "could" offset this is the added lumen's with this 40w LED capsule. I surely like the disbursed beam as long as I can still get the length compensated. TWT, road test is required but so far these are "Real Master Blasters". My tests will always continue in one of my powertoyz, so TBC......