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Need help to calculate brightness

1241 Views 4 Replies 2 Participants Last post by  Mojo_LA
I'm thinking of moving up from an Infocus 5700 to a Sharp 12000 MK2, but I am concerned about brightness.

I've got a 105" screen.

The inFocus 5700 is a light cannon. That being said, there are 1600 hours on the bulb and I have an ND2 filter in front of it to help black level. The projector central calculator puts me at 31 footlamberts, although I have no idea what that number might realistically be right now given the bulb hours and ND filter. Is half of that 31 is gone now? More? Less?

The calculator says the Sharp would give me 14 FL, not counting eventual bulb wear. I just would love to have an idea of what I might expect, brightness-wise compared to what I have now. Obviously I'm not a brightness whore if I stuck an ND filter in front of my 5700, but I don't want an image dimmer than my current setup!
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Secrets of home theater review measured 474 lumens in low power and 621 lumens in high power for the original version of the 12000. The MKII has 100 more lumens so 574 and 721.

The 5700 has 1000 lumens by manufactuer specification, which I believe is a rarity in that it is fairly acurate. So, with an ND2 filter, it would have 500 lumens.
Thanks for that helpful reply... so, essentially, with the ND filter, my 5700 and the MK2 would have about equal brightness. And I'm guessing lamp fade is probably the same with pretty much all units.

I guess the other important factor would be the lumen rating after callibration for an optimal picture... I took a look at the review in the link you sent and found this:

"With Economy on, and with the High Brightness mode of the Iris, the projector produced 15.3 ftL on my 102” diagonal unity gain (gain=1) DaMatte screen... In the Medium mode of the Iris, (Economy on), the light level at the screen fell to 7.1 ftL (218 Lumens), but the contrast ratio increased to 3085:1. In the High Contrast Iris mode, the light output fell further to 6.3 ftL (195 lumens), but the contrast ratio rose to a remarkable 4394:1. All of these measurements were made with approximately 100 hours on the bulb."

The 102" screen size is very close to my 105", so in it's "best picture" mode, the Mk II would give me maybe 7 ftL.

Without callibration or bulb wear, my 5700 is giving me about 15 ftL. After 1600 hours on the bulb, how much should I reduce that rating?

I don't know that I would reduce it much further due to callibration, since most reviews of the 5700 said the performace was pretty solid right out of the box.

Also, I can't seem to find a review that says if the 5700's 1000 lumens is with high power mode or not... I'm assuming it's in high power mode, since most manufacturers want to list the highest possible number.... I always run in low power mode, so maybe I can knock another 20% off my current brightness, which brings me to maybe 12ftL, not counting bulb wear.

So the Sharp has 7ftL, my 5700 currently has 12, minus bulb wear.

Ok, enough thinking out loud, any more comments or ideas?
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I would be surprised if the black level isn't much better. Goint from Matterhorn to one of the best 720p darkchip3 projectors made will certainly be an upgrade in black level.

I am also wondering where you are buying the MKII as I haven't seen any for sale in a few months.

Another projector to look at is the Infocus 7210 which is also bright and dark chip3 and comes in at around $1000 now. Google: woot vip 7210
I've actually read the black level on the 7210 isn't so hot... but aside from that, the 7210 isn't a very long throw unit, and I need to cast a 105" image from 18 feet back.

According to the Projector Central calculator, the 12000 is one of the few units that would work for me.

And it's a private seller who wants to upgrade.

Generally speaking, how much of a reduction in brightness is a 3000 hour bulb at the 1500 hour mark?

And while I absolutely agree that the Sharp should have a much better black level natively, remember, I am using an ND2 filter in front of my 5700 which dramatically improves black performance.
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