Has anybody tried Carclo Optic's collimating lenses? Much of them are close to the Fraen products, but they do have one with a BS of 4 degrees. 50mm in diameter and 110 Cd/lm! They have a US address too. Their Classic optics are 20mm in diameter, smaller than the Fraen ones. The resultant triple-optics cluster holder is only 45 mm in diameter, so fitting it into flashlight heads is easier. The Fraen's is 50 mm but it needed the optics cut to fit in. Don't know who retails them though. Happy experimenting!