On 14 Oct 2015, at 18:52h, Hening Bettermann <hein@xxxxxxxxxxxxx> wrote:
Edit:
On 27 Sep 2015, at 17:00h, Hening Bettermann <hein@xxxxxxxxxxxxx> wrote:
The vertical distance from the lamps to the target is 55 cm (22 inches).
And could/should they be placed outside the target surface that I try to
illuminate as even as possible? I mean they should ideally not be illuminated
at all - ?