I am starting on a new projector. I have moved to a new house and need to adjust for size again. I have the 575 watt MH from the Elmo projectors. I noticed some of the bulbs I have it makes a high pitched noise. I found some adjustments on the board that removed this noise. I noticed while adjusting I could pull more current and brighten the bulb (I actually went too far and blew a fuse).

My question is, is anyone who has one of these with an amp meter willing to check to see what they are getting for current through the main power supply (120 VAC).

I am getting 6.7 amps on the low setting and 10.3 amps on the high.

Here is where the adjustments are on the board

I have just started this project so I am still in testing but here is a couple of pictures.

I stripped the 2 silver layers from the LCD and got it into the test bed.

"My question is, is anyone who has one of these with an amp meter willing to check to see what they are getting for current through the main power supply (120 VAC).

I am getting 6.7 amps on the low setting and 10.3 amps on the high. "

I would bet your meter is giving an incorrect reading. The ballast should make a high frequency non sine wave so most meters will just blow the reading. If you can hear the lamp sing then you might be able to tell if the ballast is a high frequency or not but this will not change things.

Finding the exact RMS power of a non sine wave is really quite hard.

What type of meter are you using?

I am reading the plugged in power cord, the AC line coming in with a clamp on meter (120 vac at 60 Hz). I am getting the power for driving the fans too (0.13 amps). I do have a scope, and could check the bulbs voltage pulse if that would shed any light on what these settings should be.

I ordered a new 650mm fresnel....and promptly cut it too small. So I had to order another one. I guess I will have to wait a little longer.