Instructables - The Online Repository of User Generated Hacks and DIY Instruction has a wonderful DIY Instructable on building your own Low Cost Bili-Light Radiometer for only $38.74 in parts costs. Sure beats the $2K a Olympus Bilimeter sells for.
The Parts List Consists of the following:
34mm Blue Colored Glass Filter x 2
Pegasus Associates Lighting PCGF-MR11-BLU 2 [...]
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