I used one 20000k, one 6500k, one 455nm (royal blue) and one470nm (blue). I used 100 mm (4") PVC pipe and yes I did use optics, one 100 mm diameter glass lens f=80mm. I like it better than individual optics. All the bolts used are 6-32. The swivel mounting was supposed to be used for mounting speakers on the wall. I bought that from Walmart 5-6 years ago. I don't remember what I paid for, but it wasn't expensive.
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