DIY-Projector Plans and theory collection !!

[Varonis]

Helo,

there I draw an idea, for replacing the first fresnel with right shaped reflector:

http://buildart.lv/Faili/paraboliks.gif

-- the reflector are taken from Satelite antenna (the stuff what catches tv signal from satelites, without any tech, but with its special lever who holds the lamp in precision focus point, that the reflected light makes a paralel beam. and i place aluminium foil, inside, to make better reflection, than original white matte coating.

this i have not tested in projector, but i tested it with 500W conventional light bulb - the results vere fantastic - we get a light beam, and we can hit the clouds with this light beam! - so, i decided that it works - light beam are parallel. so it is the same what first frensnel does. and many comercial projectors dont have the first frensenl so, they have a reflector what makes paralel light beam.

the fresnel are absorbing the light, but good reflector will be absorbing much smaller percent of light, so, we wil get brighter images?

sory for my bad english

[cromaclear-crt]

did you ever try this with a projector ?

[vandevoordekoen]

Hello, I now this tread is closed for a wiile, but is there anybody who tried de elliptical reflector setup? And where are those elliptical reflector to find? Thanks.

[giorgos18]

ywh has ellipsoidal reflectors for sale but they will not be suitable for standard MH, need to use the small UHP lamps (ywh also sells them)

EDMUNDOPTICS.com sells ellipsoidal reflectors that may fit 150W CDM-T Philips lamp if you want to use Metal Halide lamp

Additional optics may be required to expand light cone from ellipsoidal type reflector since beam angle usually not very large

I will be testing with ellipsoidal and short arc uhp lamps in DIY projector soon and will post results (if succesful)