An ETC question, and I'm too slammed to look up the photometrics

[chieftfac]

How many ETC Selador Vivid Ice, 21", 2 Cell LED Striplights will it take to down wash a 35' wide x 18' high cyc?? I will be hanging the fixtures on the next downstage batten so figure 10 inches downstage and batten trim would be about 20'

Budget meeting is today at 4pm

Thanks,

[icewolf08]

How many ETC Selador Vivid Ice, 21", 2 Cell LED Striplights will it take to down wash a 35' wide x 18' high cyc?? I will be hanging the fixtures on the next downstage batten so figure 10 inches downstage and batten trim would be about 20'

Budget meeting is today at 4pm

Thanks,

Quick answer, 40 units. 20 on the top and 20 on the bottom for even coverage. Remember these behave like strip-lights, not like cyc lights. They are going to look more like an MR-16 zip-strip than anything else. To get the coverage you need a full length set on top and bottom, especially at 10" away.

[derekleffew]

Well, (35/2)=17.5, so eighteen. 10" DS and 2' above the backdrop doesn't provide much distance for the light to spread, so a continuous row is required/desired.

http://www.etcconnect.com/docs/docs_..._Note_revB.pdf , Budget solution #1, calls for nine 11' units on 4' centers, 18-36" DS of drop, "Use H60 or H80 lenses in combination with Rosco 104 or equivalent diffusion media for best results in this configuration. Orient the diffusion media for up and down spread."

[icewolf08]

Well, (35/2)=17.5, so eighteen. 10" DS and 2' above the backdrop doesn't provide much distance for the light to spread, so a continuous row is required/desired.

http://www.etcconnect.com/docs/docs_..._Note_revB.pdf , Budget solution #1, calls for nine 11' units on 4' centers, 18-36" DS of drop, "Use H60 or H80 lenses in combination with Rosco 104 or equivalent diffusion media for best results in this configuration. Orient the diffusion media for up and down spread."

Why did you divide the length of the cyc in half? I just can't imagine that you would get good coverage without scalloping if you space the units that far apart.

[derekleffew]

Why did you divide the length of the cyc in half? ...

The OP asked

How many ETC Selador Vivid Ice, 21", 2 Cell LED Striplights ...

Technically, it would be (35*12)/21, but I rounded the 21" to 2'. So twenty 2-cell units for 35' width. Hard to space them any tighter than that, without going vertical.

[gafftapegreenia]

How many ETC Selador Vivid Ice, 21", 2 Cell LED Striplights will it take to down wash a 35' wide x 18' high cyc?? I will be hanging the fixtures on the next downstage batten so figure 10 inches downstage and batten trim would be about 20'

Budget meeting is today at 4pm

Thanks,

Why the Vivid Ice? Don't need to red/ambers/yellows?

[chieftfac]

Sorry, did a copy paste into the first post wrong fixture!!! After reading that tech sheet from ETC (Thank you derekleffew!!) I am putting 20 - Vivid-R SELVR11, 11", 1 Cell LED Strip-lights in the budget. I need the flexibility of the 11" fixtures for when a cyc is not used. With yokes and lenses it should meet my $28000.00 line item. Now if they will only let me spend the money...

Edit - I should add that I am currently using 3 R40 strips, 3 circuits each, lamped at 150w so I can run them on 3 dimmers. I can't afford to lamp higher and use 9 dimmers. I'm hoping 20 Seladors will make an improvement...

[sk8rsdad]

Sorry, did a copy paste into the first post wrong fixture!!! After reading that tech sheet from ETC (Thank you derekleffew!!) I am putting 20 - Vivid-R SELVR11, 11", 1 Cell LED Strip-lights in the budget. I need the flexibility of the 11" fixtures for when a cyc is not used. With yokes and lenses it should meet my $28000.00 line item. Now if they will only let me spend the money...

If versatility is the driving force behind choosing SELVR11's then consider opting for the D40 instead. They're brighter, easier to cable, and take standard 7.5" frame accessories. Otherwise, you may be better off with SELVR42 or SELVR63 fixtures or another manufacturer for a dedicated cyc light.

I'm using 16 D40s on a 40' x 24' cyc with minimal scalloping depending on whether they're set up for near and far lensing on every other D40 or full coverage top-to-bottom with all of them.