[SML] LED room lighting

[Dan Sheehan]

Lumens would be the amount of light emitted by a source.
Illuminance would be how brightly the target is lit.

Between the source and the target is optics.

Example, take two S4's with same lamp and level,
one with 50' lens, other with 19' lens,
same throw distance to a target wall.

Both produce the same quantity of lumens from the instrument,
but the tighter lens will produce much brighter (but smaller area)
illuminance on the wall


On Mon, Aug 12, 2019 at 8:59 AM Stephen Litterst via Stagecraft <
stagecraft at theatrical.net> wrote:

> On 8/9/19 1:50 PM, Jerry Durand via Stagecraft wrote:
> > Are there some rules of thumb for fixture wattage for various rooms
> > (shop, lounge, etc.)?  I know LEDs vary a lot in efficiency (see below)
> > but most common LED assemblies seem to be sold by Watts.
>
> The needs are different, depending on what each room would be used for.
> And the guidelines are given in illuminance, since lumens per watt
> differs wildly from fixture to fixture.
>
> Digging into an old textbook, I found this chart --
>
>
> https://books.google.com/books?id=vfcFAAAAQBAJ&pg=PA333&lpg=PA333&dq=Table+14-2+Machine+Shops+and+Assembly+areas&source=bl&ots=wIwBd3dGpO&sig=ACfU3U0SXtvnI_Rwb2TB8vKBjucEG2ssCQ&hl=en&sa=X&ved=2ahUKEwiFifvYsP3jAhUIhOAKHQUSDrcQ6AEwCnoECBIQAQ#v=onepage&q=Table%2014-2%20Machine%20Shops%20and%20Assembly%20areas&f=false
>
> If the link doesn't parse, it's from "Industrial Electricity
> By Michael E. Brumbach" Table 14-2, Machine Shops & Assembly Areas.
>
> Steve L
>
>
>
> --
> Stephen Litterst            Technical Operations Supervisor
> litterst at udel.edu           Mitchell Hall
> 302/831-0601                University of Delaware
>
>
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-- 
...Dan Sheehan
Fixer of things that break
TD Walpole (MA) Footlighters
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