Lumia Projector Build

[swamidog]

new guy buys the lattes.

Yeap, there aren't any dues - no meetings - you just begin to recognise the members - and really - the pennies were a nice touch.

[Mindwaave]

new guy buys the lattes.

Well, at least there's no hazing. (Yet...)

[hakzaw1]

BUMPING this thread- LUMIA is nearly 100yrs old- and the new interest in it is great.
I would like to hear more about using it and the MPE-- Could one build a LUMIA PJ that is eye safe? Crowd scans? and basically the same Q in regards to Diffraction gratings?

I will send these Qs to Greg and Patrick at ILDA- I meant to ask at the LSO course right after SELEM 2013--but forgot.. TY to all who share LUMIA passion and info- this forum rocks!!

[Galvonaut]

I would like to hear more about using it and the MPE-- Could one build a LUMIA PJ that is eye safe? Crowd scans? and basically the same Q in regards to Diffraction gratings?

I've just completed my LSO training with LVR here in the UK and this was one of the questions that I asked.

James Stewart told me that with lumia you just measure the hotspots or otherwise keep the hotspots outside of the safe zone.
[edit] Measuring hotspots of lumia could be a VERY time consuming job[/edit]

With diffraction grating effects, it depends on the type of grating.

With burst gratings there tends to be a zero order beam right in the centre of the beam which may have 70% (IIRC) of the initial beams energy. This beam can be kept away from the audience. The great thing with burst gratings is that once the zero order beam is above the audience, the weakest beams hit the closest people and get stronger further away.

Line gratings don't split the beam as much, so power will be higher than with burst gratings. They may also create hotter beams, away from the zero order beam, so you need to check a selection of the brightest spots.

Keith

[swamidog]

instead of measuring the hot spots, wouldn't it be easier just to measure the raw beam at termination point with the effects wheel removed? there's no way any lumia hot spots will have higher power than that.

I've just completed my LSO training with LVR here in the UK and this was one of the questions that I asked.

James Stewart told me that with lumia you just measure the hotspots or otherwise keep the hotspots outside of the safe zone.
[edit] Measuring hotspots of lumia could be a VERY time consuming job[/edit]

With diffraction grating effects, it depends on the type of grating.

With burst gratings there tends to be a zero order beam right in the centre of the beam which may have 70% (IIRC) of the initial beams energy. This beam can be kept away from the audience. The great thing with burst gratings is that once the zero order beam is above the audience, the weakest beams hit the closest people and get stronger further away.

Line gratings don't split the beam as much, so power will be higher than with burst gratings. They may also create hotter beams, away from the zero order beam, so you need to check a selection of the brightest spots.

Keith

[Galvonaut]

instead of measuring the hot spots, wouldn't it be easier just to measure the raw beam at termination point with the effects wheel removed? there's no way any lumia hot spots will have higher power than that.

That's far more sensible. The same as you would do for mirror ball effects (post mirror - stationery ball).

[hakzaw1]

Thanks for the replies-

The one 320mW RGB 3D only projects thru several rotation gratings and as the RC has pause it will be very easy to LPM- I already know the hottest spot will be the center dot in some of the images as it is white and by far the brightest- Once i know that I believe if I have the distance to the nearest person and the time this white dot appears (except in pause) I think that may be all I need to see if the MPE is met.
Considering the 7mm pupil size- and the fact that neither the spots nor the people are really static and the auto blink reflex this PJ may very well be safe-

BBL with some YTube links show this 3D PJ--

it blows any Bliss Light away--and the wireless RC is a very nice feature- you can make the Pj go to one color only or any combo of these three-has also sound response w/settings from 1 to 9- you can make it stay on any one of the EFX.-- it has DMX but NO Ilda- (NO dippy switches)

PM if you want one of these=--TY hak

[Cameron]

Well, at least there's no hazing. (Yet...)

True. Can't afford a Hazer.... yet

[hakzaw1]

Thanks for the replies-

The one 320mW RGB 3D only projects thru several rotation gratings and as the RC has pause it will be very easy to LPM- I already know the hottest spot will be the center dot in some of the images as it is white and by far the brightest- Once i know that I believe if I have the distance to the nearest person and the time this white dot appears (except in pause) I think that may be all I need to see if the MPE is met.
Considering the 7mm pupil size- and the fact that neither the spots nor the people are really static and the auto blink reflex this PJ may very well be safe-

BBL with some YTube links show this 3D PJ--

it blows any Bliss Light away--and the wireless RC is a very nice feature- you can make the Pj go to one color only or any combo of these three-has also sound response w/settings from 1 to 9- you can make it stay on any one of the EFX.-- it has DMX but NO Ilda- (NO dippy switches)

PM if you want one of these=--TY hak

UPDATE well I metered the bright white spot that we see in some of the patterns and it made 49mW so while I am not sure it looks like this may have too much power to be eyesafe.
At least if you pause it and and someone stares at that spot directly from in front-I made a video about 2:30 long but the music was too loud so the sound part sucked- also the red barely showed up in my vid.Will keep trying and will link a better vid when it happens.