These sort of spots were all the rage years ago, we used to make some to fit bowens flash. the big problem is the heat as you need the model lamp on full to see whats going on and the heat produced is a major drawback. the range of rosco gobo's is vast over 900 types all for around £ 6.00 each. if you get one cheap, its worth trying but you soon get tied of it and put it back on the shelve. when we launched ours at focus 12 years ago we had loads of interest, it had zoom lenses, fan cooled, came with 10 gobo's, set of coloured gels, all for £ 250.00, we sold 5 in 3 months total waist of time and money. best of luck David