Well, the name is not just trs, trs but it is a good effect (see video at: dailymusic.fr / planetsono)
Unlike simple derbies, it possde a color changer.
New price: 99 Euros
Vido: https://www.planetsono.com/image/video/derby% 20laser.mpg
Anyway ... is the Boost!
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evassono's review (This content has been automatically translated from French)
Very nice effect. It is much better now that classic derby. small inconvnient: rondolux his lamp 500w is almost impossible to find and expensive compared to the price of Derby: I pay 65 euro (nine) and the lamp cost 59 euro.