PhotonWrangler
Flashaholic
Here's an article with some photos of the LED fixtures. Video story here.
Those look like some pretty powerful floods. I can't help but wonder if they're forced air cooled or just passively thru the housing.... which looks like it may be a lil undersized for that amount of LEDs.
Would be nice if we could find solid specs on those!
The ability to bring the house lights all the way down or up on demand is incredible for stage shows. There are a few kinds of lights I remember: High-power actor spots: No dimming, but a moveable shutter to change beam width & intensity Can lights - Filaments, dimming OK, 0-100% takes a few seconds. LED wash - Instant changing & control House lights - High-Bay may not dimThose do seem to be impressive specs! I look forward to watching the game and seeing how well they do. Output and efficiency are Def respectable. The fact that they can be incorporated into the entertainment aspect is very cool! I can already see the headlines "STROBING STADIUM LIGHTING CAUSES 1000s OF SEIZURES DURING HALFTIME SHOW" Lol
They are right here. Exploded diagram here. They appear to be completely passively cooled. 1000W total power and 115 lumens/watt gives about 500-600 watts of waste heat. The heatsinks they have there are more than enough for that amount of power.
Since these are professional and permanent installations, I think it's a given that they are current driven and won't use PWM as a control method exactly because of the television issues that you describe. PWM is usually used when you need a very cheap and easy way to dim an LED.
On the exploded diagram, page 2 diagram note 2 they state the fixture uses PWM. I do like the laser aiming,
Good catch. Not sure how I missed that. I guess they are just doing it at a really high frequency then, or are doing it at a frequency that doesn't interfere with the video feed. Not sure why they went with that instead of constant current control other than maybe efficiency.
But we don't care about how many lumens are in boxes in the rafters. We only care about the lux (or foot-candles) on the playing field. That's the key metric to compare with these: How much area of the field is lit to playing intensity by a given unit (Watts or $ of lighting).Doing the math, and using even the lowest lm/watt of mh lighting(65 lm/w), the total lumens are gonna be less than half! 80 million versus 36 million
Doing the math, and using even the lowest lm/watt of mh lighting(65 lm/w), the total lumens are gonna be less than half! 80 million versus 36 million
maybe to avoid a shift in color?
With all of those LEDs, though, I would have thought they could just shut off a fraction of them to drop the output without having to PWM or adjust the current as much.
On the exploded diagram, page 2 diagram note 2 they state the fixture uses PWM. I do like the laser aiming,
For those who haven't done the math:
(312 fixtures)*(115,000 maintained lumens per fixture) = 35,880,000 lumens!
I don't know about you guys, but I'd love just ONE of those fixtures, mounted at the apex of my roof on the back of my house to light my entire yard. Right now I'm just using 6 spotlight bulbs rated for about 1,600 lumens each, and that's decent, but this would be MOARPOWER
I wonder which would be cheaper...Imagine how many v54 lights would be needed to do the same thing! Like 1,485 xm18vn!