Replacing the modeling lights with white LEDS will likely have the effect of
changing how
accurately the preview of the flash picture is seen in the viewfinder. This is
because bright
LEDS, all have a built in lens which will significantly change the beam pattern
compared with the
filament lamps they replace. The small filament lamps are more like
omnidirectional point sources
rather than partially collimated beams of LEDs. This means the filament lamps
will reflect off the
flash reflector and thus more accurately approximate the beam produced by the
real flash tube.
You could try to place diffusers over the LEDS or roughen their surface with
sandpaper or
chemicals but then light output may suffer too much. An interesting test you
might try would be
to see if it looks different after taping a few layers of etched mylar tape
(Magic tape)directly
over each LED. Unfortunately it is easy to mar the surface of the reflector
with finger grease or
tape goo so might not be a good idea.
I would guess choosing LEDS with a bit wider beeam pattern is likely a bit
better than the very
narrow beam pattern often used to get brightness up. Look up the vendors data
sheets online.
Just some thoughts,
Tim Hughes
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