dear srinishare,
i've 2 fresnel lenses i brougth from lensel
220&330mm fl dimension: 310x310mm
so am decided to build a projector using 13.3 hd lcd panel.
am waiting for that.. the mh lamps are too hot and they need more power is their any other suggestions to make a projector without metal hallide lamps????
i've 2 fresnel lenses i brougth from lensel
220&330mm fl dimension: 310x310mm
so am decided to build a projector using 13.3 hd lcd panel.
am waiting for that.. the mh lamps are too hot and they need more power is their any other suggestions to make a projector without metal hallide lamps????
thank you shrini
HI shrini,your information is of great help.but one confusion about the heat shield you mentioned which is available in optolife.the dimension of the heat shield is much smaller than the fresnel/lcd.so would it properly protect the fresnel and lcd?how is your experience?thanx in advance
HI shrini,your information is of great help.but one confusion about the heat shield you mentioned which is available in optolife.the dimension of the heat shield is much smaller than the fresnel/lcd.so would it properly protect the fresnel and lcd?how is your experience?thanx in advance
proforma
dear jayakumar "please follow this link,he is from philiphines and most successful in making DIY projector.latest projector results are in this last page.believe the amazing pic.
http://www.diyaudio.com/forums/diy-projectors/33356-diy-projector-philippines-74.html
dear akil
As per Hertzblaster member view 250w Mh lamp with condenser lens use some less power than 400W .U can go for LED with condenser lens,but it is costly for me.
this link is for led condenser lens
here is a attachment for the proforma i got from optolife.
60mm Lens Reflector with Base for 20-100W LED Lamp Blub | eBay
100w LED - Free Shipping - DealExtreme
this link is for led only u have to search for suitable driver for this led (price may be equal to led price)
BRIDGELUX|BXRA-N3500-00000|ARRAY, NEUTRAL WHITE, 3500LM | element14 India
dear jayakumar "please follow this link,he is from philiphines and most successful in making DIY projector.latest projector results are in this last page.believe the amazing pic.
http://www.diyaudio.com/forums/diy-projectors/33356-diy-projector-philippines-74.html
dear akil
As per Hertzblaster member view 250w Mh lamp with condenser lens use some less power than 400W .U can go for LED with condenser lens,but it is costly for me.
this link is for led condenser lens
here is a attachment for the proforma i got from optolife.
60mm Lens Reflector with Base for 20-100W LED Lamp Blub | eBay
100w LED - Free Shipping - DealExtreme
this link is for led only u have to search for suitable driver for this led (price may be equal to led price)
BRIDGELUX|BXRA-N3500-00000|ARRAY, NEUTRAL WHITE, 3500LM | element14 India
Well ,when i surf different websites regarding DIY projector,i came across a projector work with some pictures.in that i saw only small glass covering hardly around only the lamp lens.but the project was working good.
i dont remember the website link.
hey guys am selling my triplet lens 317mm fl . if any body wants it pls contact this mail id akhilcharampilli@gmail.com
Last edited:
hi ,if u have one of those led will u show its specifications and a picture of it.
Grooves should face each other - rear fresnel grooves face the
front fresnel and the front fresnel grooves face the rear fresnel. So it
appears your drawing is fine. The rear fresnel is usually the shorter
focal length (220mm or so), and the front fresnel should match the
focal length of the triplet lens.
The spotlight is unlikely to work for a projector. You need a high
power module like one of the ones below -
PRIME 70W 5600-Lumen 6500K LED Emitter Metal Plate - White (32~36V) - Free Shipping - DealExtreme
80W 6400LM LED Emitter Metal Plate - White (32~36V) - Free Shipping - DealExtreme
80W 6400LM LED Emitter Metal Plate - White (32~36V)¨C DealExtreme Reviews
You will need a high power LED driver for it. Dealextreme has a few different
choices, so you need to find a suitable one -
3.0A 100W Power Constant Current Source LED Driver (85~265V) - Free Shipping - DealExtreme
After a long time I am logging to this thread. I could see a lot of people are thinking about the LED option. Just wanted to inform you guys that please check the lumen o/p of the LED. I had seen a 250W Osram MH and personally used 400W Orsam MH bulb. Only with a 400W bulb, I could get a decent light-throw out of the PJ as the LCD will absorb a hell lot of lumens and a lot of light will be lost because of the box size and the lcd screen size. Even a 400W MH bulb with 32000lumens could o/p only some where around 300-400lumens from the PJ (may a 100 more if the anti glare screen from the lcd is removed). Compared to a 400w bulb, a 250w with ~24000 lumens, I felt very dull even in a fully dark room.
The LEDs mentioned above has only ~7000lumens and assume how much will be the resultant o/p and decide. I would suggest as of now its better trying the MH lamps as it has more VFM. Also once the build is tweaked properly, experiment with LEDs or build one PJ with LED as a group effort and see the result and then others can try. Also google to find out the number of success PJs with LEDs, I could find only a very few (from the pics) and dont believe them fully as most of the pics related to DIY PJs floating in net are manipulated, there are many chances that you may be disappointed in real time.
The LEDs mentioned above has only ~7000lumens and assume how much will be the resultant o/p and decide. I would suggest as of now its better trying the MH lamps as it has more VFM. Also once the build is tweaked properly, experiment with LEDs or build one PJ with LED as a group effort and see the result and then others can try. Also google to find out the number of success PJs with LEDs, I could find only a very few (from the pics) and dont believe them fully as most of the pics related to DIY PJs floating in net are manipulated, there are many chances that you may be disappointed in real time.
thanks for the timely advice.i thought of using 250W lamp.my doubt is did u get a dull picture with 250W lamp even with a condenser lens used for Lamp.
thanks and regards
Srinivasan
My two cents on LED vs MH debate:
1) We tend to forget how much a 400W MH will add to your electricity bills, especially in India. Imagine the additional cost you will have to bear if you use your 400W pj for 2 years.
2) With LED you could possibly squeeze the box size a great deal if you plan to use a smaller LCD and a rear fresnel with shorter focal length. That would result in a brighter projection, too (inverse sqare law).
3) You can get an instant restart with LED. MH needs cooling for 5-10 minutes.
4) MH emits light in all direction (360 degrees) compared to about 120 degrees for LED. So for the same lumen output, LED will have much higher % of light hitting the triplet. Of course one can add a reflector to enhance MH productivity.
I haven't been able to get a bright projection with anything less than 400W, so I'd rather go the LED way, even if a 150W LED is a costly option. I believe a 150W LED setup (with a good precon) can match a 400W MH one (no reflector). Will be able to confirm once I'm done with my LED experiments.
-Rishi
1) We tend to forget how much a 400W MH will add to your electricity bills, especially in India. Imagine the additional cost you will have to bear if you use your 400W pj for 2 years.
2) With LED you could possibly squeeze the box size a great deal if you plan to use a smaller LCD and a rear fresnel with shorter focal length. That would result in a brighter projection, too (inverse sqare law).
3) You can get an instant restart with LED. MH needs cooling for 5-10 minutes.
4) MH emits light in all direction (360 degrees) compared to about 120 degrees for LED. So for the same lumen output, LED will have much higher % of light hitting the triplet. Of course one can add a reflector to enhance MH productivity.
I haven't been able to get a bright projection with anything less than 400W, so I'd rather go the LED way, even if a 150W LED is a costly option. I believe a 150W LED setup (with a good precon) can match a 400W MH one (no reflector). Will be able to confirm once I'm done with my LED experiments.
-Rishi
The high powered LED lamps that I know are not a single point source (only seen till 40-50w), but leds arranged in matrix and what i had heard is that it has its own issues in light throw and cannot be evenly concentrated using a condenser lens. Need experiments...
Also ~7000lumens of LEDs can never be same as 32000lumens from MH, if so then its good.
Finding a smaller HD lcd screen for a budget build is almost impossible, I tried a lot to get a 720p samsung panel with HDMI controller, but it was very expensive (with shipping and customs).
Looking at the LED projectors posted on lumenlab and by
ywh and Hertzblaster, it appears they use shorter focal length lenses and
hence much shorter throw and image size than the ones we
use with MH bulbs. They also have condenser lenses which
helps to reduce the distance between the LED and the LCD.
I understand the brightness varies with the inverse square of the
distance, hence it helps to have the LED projector closer to the screen.
Here are some numbers from Hertzblaster's thread.
LED: 128w 13,000 lumens.
Projection lens 265 mm focal
Fresnel lens 120/220mm focal
aspheric condenser lens:75mm focal
ywh and Hertzblaster, it appears they use shorter focal length lenses and
hence much shorter throw and image size than the ones we
use with MH bulbs. They also have condenser lenses which
helps to reduce the distance between the LED and the LCD.
I understand the brightness varies with the inverse square of the
distance, hence it helps to have the LED projector closer to the screen.
Here are some numbers from Hertzblaster's thread.
LED: 128w 13,000 lumens.
Projection lens 265 mm focal
Fresnel lens 120/220mm focal
aspheric condenser lens:75mm focal
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