> I got an e-mail back from a chap who runs a colour-blind association 
> website; he's told me that Blue and Yellow is a safe combination.

http://www.lc-led.com/Products/department/27

http://www.lc-led.com/View/itemNumber/411

DIFFUSED Bicolor Blue (3,000 mcd) & Amber (3,000 mcd) LED
(Cathode): 75 Degree

3mm milky diffused blue and amber bicolor led lamp. Colors: InGaN
blue (465 nm) and InGaAlP amber (590nm). Intensity: blue 3.0 cd
(Vf = 3.3V)and amber 3.0cd (Vf = 1.8V). Viewing angles: 75 Deg.
Common Cathode to Blue Anode and Amber Anode

Click here for datasheets and technical specifications. 

To order samples(15 pieces $25.20) click here. 

Pricing Information:

15-99 pcs :  $1.68 USD 
100-199 pcs :  $1.18 USD 
200-299 pcs :  $1.05 USD 
300-499 pcs :  $0.95 USD 
500+ pcs :  $0.91 USD 

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