How to demonstrate RGB=White to kids

robj

New elf
Joined
Jan 5, 2013
Messages
24
Anyone have a good way to demonstrate the additive property of combining Red, Green and Blue result in white light? I want to show a group of kids but can't find a good demo project. Tried flashlights with home made filters but can't get the mix to work.

Ideas welcome!
 

Madko

Full time elf
Joined
Dec 24, 2012
Messages
250
Location
Castle Hill NSW
Other then using a pixel and setting it red, green, blue then all together ( had to say that as this is a lighting forum), if you can make a round wooden disc, divided evenly into three sectors. Paint each sector red, green, blue. Drill a hole in dead centre and put a long bolt and clamp it into a cordless drill. Hopefully you can get the colours right then hopefully at a high speed (theorically) white should appear!
 

penguineer

Full time elf
Joined
Feb 18, 2011
Messages
202
Location
Mount Tamborine, Qld
Sort of a class thing?

How about dumb nodes with seperate red, green, blue channels and a physical dimmer switch for each channel - using computer+software+magic boxes in the middle makes the whole thing look too staged, get the kid(s) to control it.

Get a volunteer to control each dimmer
- each volunteer plays with their own dimmer in turn so they can see the control they have over the colour(each returns to zero after their turn)
- each colour gets turned on slowly in turn (slow add to white)
- get them to make specific colours (which colours add to which to make what)
- free play, see what colours they can work together to mix

Should need a dumb string, power supply and three dimmers as well as cable to connect together.

Dumb String:
http://www.aliexpress.com/store/product/IP68-DC12V-input-12mm-through-hole-LED-channel-letter-RGB-color-100pcs-a-string/701799_522236867.html

Single dimmer:
http://www.aliexpress.com/store/product/LED-Dimmer-DC12V-24V-input-P-N-LN-XDIMMER-1CH-12V/701799_307327655.html

Three dimmers on one block:
http://www.aliexpress.com/store/product/3-channel-led-constant-voltage-dimmer-DC10-30V-input-6A-each-channel-output/701799_533629672.html

How does that sound?

Cheers
 

BradsXmasLights

WiFi Interactive
Joined
Dec 23, 2010
Messages
581
Location
Brisbane, Australia
I remember the RGB Colour mixing display at the Queensland Museum as a kid. It was just 3 dimmer sliders with separate stage lights for each colour. Worked a treat!
 
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