Brightest light in the room

[BobJ]

Pretty standard question here as LED devices are changing very quickly. I'm cruising the net looking for a very real replacement for some 500w Halogen ellipsoids and 500w Halogen Fresnel PAR cans. Ideas to save my fingers welcome.

[Tomo]

Some important questions to consider:

 

Rough budget for each of the three?

- LED Ellipsoidals and Fresnels are the most expensive, LED Pars are the cheapest.

 

Theatre, TV/film or rock'n'roll?

- Noise level, dimming performance, physical size.

 

Colour mixing or "white"?

- "White" (inc. "Warm/Cool") LED does not gel like a halogen, you get very different results. If you want to colour them, you need colour mixing.

- Lee made a range of gels specifically for "cool white" LED that produced a roughly similar colour as their 'normal' gels, but they were never widely available and I'm not sure if you can still get them.

 

Do you want them to illuminate people or just for beams, blinders and white cycs?

- RGB has awful colour rendering, but if it's for beams/blinders that may not matter.

- "White" has a CRI. 80 is a general minimum to look for (anything under that is pretty awful), but for theatre/museum you'll probably want 90+

 

Repeatability/Variance between fixtures?

- Does it matter whether they're all the same colour?

- If yes, you need a calibrated fixture with coloured emitters that can compensate. "White", "Warm/Cool" etc cannot do that.

[gyro_gearloose]

There are some white LEDs out there that have a CRI of 90, but you’d I’m not sure which fixtures use them. I’ve been looking at them to retro fit some Prelude Fresnels which have knackered lamp bases/reflectors.

 

Yes, I know that I can replace the T26 lamp bases, I have replaced a few not that long ago, but many of our reflectors are worn out.

[Gerry]

There are some white LEDs out there that have a CRI of 90,

 

Can you provide a link to these LEDs please?

Been looking for some to replace lamps in Minim Fs.

Cheers

Gerry

[gyro_gearloose]

There are some white LEDs out there that have a CRI of 90,

 

Can you provide a link to these LEDs please?

Been looking for some to replace lamps in Minim Fs.

Cheers

Gerry

 

Hopefully this link should work. There are some Cree LEDs which have a CRI of 91, and produce over 10,000 lumens. I haven’t had a chance to read through the data sheets yet, so I don’t know if there are suitable dimming drivers available for them.

[BobJ]

Excellent hit list;

Rough budget $500 - $2000 ea

Theatre, Moderate noise level. Dimming performance not important. and physical size about same as legacy lamps.

Colour mixing or "white"? That worried me;

We're using 3 ADJ Encore 1000 in a small theatre and they work well.

 

To get a brighter light we thought we'd need white LED light, but then we get the gel problem.

So a "white" 90+ would be difficult the gel?

Small theatre so calibration not important. As long as we can get a decent amber the rest can be coloured 'mood.time of day' etc.

Want to illuminate people. But white cycs also on the books

Repeatability/Variance; Not concerned. We are talking up to a dozen of the same, not hundreds.?

All the same colour? Yep, we want black

[timsabre]

Well for colour mixing spots the top pick is the ETC Lustr fixtures, which use 7 LED colours to get the best CRI, but they are expensive.

 

As a cheaper alternative the elation LED spots are pretty good, use 5 LED colours to get good white with high CRI. You'd be hard pressed to tell they were LED just looking at the light output.

 

https://www.elationlighting.com/colour-5-profile