musht

quote name='kerry davies' Is this the right time for theatres to think about Heating and Ventilation in a serious way? Theatres have always treated HVAC in a serious way, from sliding roofs and sunburners, as Adam2 mentioned, to air-conditioned being a head line item on the poster`s. Comfortable air is as much of the theatre experience as dimming houselights. https://williamsugghistory.co.uk/?page_id=67 Ozone generators were a feature of 30`s super cinema air systems. http://www.villagehallcinemas.co.uk/%23cinema/cinephoto/odeon_leicester_sq_cut_away.htm >>My council is building energy neutral flats using air source heat pumps as a combined heating and air conditioning system. Air source heat pumps are now making it to dom35t1c market, reasonable bet the residential insulation is still sub optimal, insulation not a trending green thing, its how a lot of commercial buildings are already heated , cooled and ventilated, Centrepoint tower block was centre of all sorts of conspiracy rumours because it was one of the first sealed office blocks, no opening windows, >.If theatres need air filtration then going down that path might be the most long-term cost-effective means of doing so. They already do, being windowless boxes they have to, HVAC is a service you didn`t know existed until they put something where you had wanted to ;-) >Sooner or later the normal central heating systems will all have to be replaced with fossil fuel free systems anyway so why not combine it all? In large buildings its been replaced with er, gas, Combined Cycle Gas Turbines burning Qatari gas running generators to back up everyone on those cold, cloudy, still days... Air quality is liable to be condsiderably lower on your trip to the theatre, by bus , train , or in a pressurised tube full of re-cycling air by plane.

Ozone generators used to be a feature of air conditioning, clean up the recirced air. Ozone starts smelling at some tiny quantity in PPM, bit of an irritant that will eat most synthetic materials, Power density and shadowing make UV sterilising large areas look more like cleaning theatre than actually cleaning the theatre....

Possibly a dose of marketing puff in it, but interesting https://www.ledsmagazine.com/lighting-health-wellbeing/article/14178406/osram-like-signify-is-ramping-up-conventional-uvc-lamps-to-fight-covid

I`ve had two meters tested in the past, by the time got to billing querys on No.3 they were keen to sort their admin problems out. Testing meter`s is an involved and expensive process, gentleman in charge of lab told me about one that only misbehaved at -1 C, accurate at all other temps, was mounted in a North facing porch. Utility suppliers make used car salesmen look like saints, lies, forged bills and attempts to test their own meters, all activities no longer surprised by major PLC`s trying it on.

The uplighter sits in a sleeve that's cast into the concrete, there's a bit of detailing to cooperate with the concrete contractors to get right.

Sunricher or LTech for quality far East, ISTL for quality British https://www.istl.com/ Constant current isnae fussy about wire length, drivers can be very remote. Inground uplighters are a massive pain, the Collingwoods are only walk over rated, for anything reasonably tough , drive over rated which requires a surprisingly large hole, they all fill up with water and condensate. Try and steer client to another solution...

Vinegar and brown sauce be acetic acid, coke it`s phosphoric acid aka rust converter and etch primer on aluminium.

Current WS2812 style only 8/12 bits per colour https://www.lightkraken.net/doku.php?id=48bit_64bit_serial_leds Cannae find the edit, will get added to the Tacklind list https://docs.google.com/spreadsheets/u/0/d/10pHG7_VIVltyqJK1Y0T5g3Iq6YJV2MnhMp3UcAVB-GA/htmlview#gid=961824890

http://www.theater-technisch-lab.nl/indexdim.htm in mebbe?

WS2815 is a current hog even when dark due to the way it works, bypasses LEDs out via fet. WS2813 is the 5V backup data device, no external capacitor that the 2812 has. Tape can have it`s challenges permanently outdoors getting temp cycled, think solder fails or wire bond failure on really cheap LEDs, but do think the days of all but the cheapest failing easily are generally past. 5V tape will light on 4.2V of Li-Ion, think 18650. No brand neutral cure silicone ,gunned out of a tube.

The front firing profile in 96 LEDs/m has reasonable chance of being readable, usually mounted in a routed channel , perhaps a routed shader to sink the front face of the `neon` below the surface. BTF also do empty silicone `neon` profile if you want the fun of pulling the strip through. The cabochon style are definitely sunlight visible, they`re 5050s with polycarb diffuser. 5mm LEDs still have their uses, but its a load more wiring https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20200310050752&origin=y&SearchText=led+gas+price

Depends on the resin, slight difference in refractive index will turn the interface into a near perfect mirror. Wide variety of clear potting resins available and clear silicones. As suggested above LED neon https://www.aliexpress.com/item/4000074841092.html

With reflective or transparent body can mount the tape round the inside edge side firing, making the centre squares of the 7 seg figure 8 to a divisable, ie 150mm for 9 LEDs per side on 60leds/m tape. of the tape spacing so can wrap a single strip round top part of 8 and a U round bottom part. Less joints is good. PLA is OK if coated, PETG much better, ASA best but hardest to print,

Pixel tape in coving, choice of low cost BT / WiFi controllers , Sp105 Sp108 etc , even integrate with Alexa with some crowbaring

https://www.draw.io/

Advertising projector will bring a few results on Ali, like https://www.aliexpress.com/item/33024202426.html

Different optic, as suggested in different topic https://prolight.co.uk/product/ledj233

On cue, `Malaysia returns 42 containers of 'illegal' plastic waste to UK` https://www.bbc.co.uk/news/uk-51176312 `Once returned the item can be re-cycled by scrapping or repair.` In places like Guiyu http://content.time.com/time/photogallery/0,29307,1870162,00.html

WEEE isn`t what it appears to be, balance of large amounts of Far East imports is there is a large amount of empty capacity heading West to East, sometimes chock full of Western waste. If only other sectors were subject to take back legislation, supermarkets with all their plastic packaging..., back at the topic 50K hours seems to be often replaced with anywhere from 15-30K hours on lamps now, which on some of them may be the expected life of the driver rather than the emmitter. Been through this with compact fluros that had lifespans of less than 1K hours because of duff driver electronics. Rush to replace fluro with LED, T5 fluro lamp has a genuine 25K hour usable lifespan, like most sources, tungsten excepted, light output will drop over time. LEDs are still very sensitive to heat , its one thing to add a chunky heatsink, it seems another to actually bother adding any thermal path from the LED to the heatsink in some designs. There is a Standard aiming for interconnection, Zhaga, but replaceable light engines fall over at the driver probably having a shorter life than the LED array and matching latest advance to driver standards from years ago. https://www.zhagastandard.org/

Could always go pixel to relay, North American supplier ;-) https://www.pixel2things.com/9-AC-Outputs-Fully-Assembled-p137348814 Not at all sure how the DMX stream is obtained as an output.

ADJ did make a relay pack once but since dissapeared. In UK QTX 4 and 12 channel DMX relays https://cpc.farnell.com/qtx-light/154-111uk/DMX-relay-switch-pack-4-channel/dp/DP32807?st=qtx%20relay Dinnae think Blue Point and Milford are related, there`s also Northlight http://northlightdmx.com/DMXtoRelay.htm?fbclid=IwAR1xb_KYwaXnnNak9tnTqmADKHANWGJUvJzK1XEQrl0XPVxd6kfLGezb4ww dunno if any allow byte wide addressing.

Arrow LED tape :-) https://www.aliexpress.com/item/4000068715326.html Alternatively correx and pixels or cabuchons https://gilbertengineeringusa.com/ https://www.boscoyostudio.com/

Low pressure sodium, SOX, are now no longer made anywhere in the World, Philips in Hamilton was the last factory https://www.dailyrecord.co.uk/news/local-news/end-era-remaining-70-jobs-17960244 Complex lamps may disappear into history.

Seems to be issue with the SPI ,seperately clocked , pixels, APA102 springs to mind, theoretically manage Mhz, in real life not so much. WS2815 12V tape dosen`t come with any substantial cost penalty over 5V strip, cuttable per LED with easier power injection. 5V tape for RGB+ , wearable and portable applications. Any USB power bank will give you 2.1A at 5V Power and signal distribution few ways emerging: PSU & Driver in box beside prop, Mains power and ethernet connection to box, or battery and wifi connection. Keeps data path as short as possible(more than 10` is a long way for unbuffered pixel data) saves V drop on power to prop. Possibly noisy fan cooled PSU Driver in box with remote data connections. Using RS485 Tx/Rx either end of CAT5 for data, combined with ground isolation and seperate PSU at prop end or data ground return on same line or 24/48V buck convertor from spare pairs. No concerns about data run distance and no bulky boxes beside prop. Advaenttec ;-) PoE , latest standard allows 70W delivered,high power PoE switches are expensive and the chipsets are rare at mo`. HiPoE + 60W delivered used for CCTV , switches and midspan convertors more available buts its only 60W. Passive PoE, as above cram 48V down spare pair on Cat5 and mini buck at receiver end. Interesting look at some options: http://www.jdeation.com/ Connector options another debate,as long as its not blooming pigtails or just dangling Wagos... How much damage can a incorrectly plugged Speakon do....?

UCS8903, UCS8904, MY9231, MY9291 list from about year ago, rare to see them in the wild in something useful like tape. World Semi about to launch a new 16 bit in 2121 format aimed at screen makers.