Trust me on this, don't waste your money on the single brights as I did. Do yourself a favour and buy the double brights, you will not be sorry. Much brighter. I like them mucho better.
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Don't have pictures, but here's a video of my double brights on a 75. I went with Beamswork brand and have been very happy. They were cheaper and brighter than the Marineland double brights on Ebay. http://www.youtube.com/watch?v=y9P8XBNOHRw