Yes, the megaray was the original. The Trex is made from the same blueprint as the megaray, so effectively the same bulb. I believe the megaray undergoes more testing though, a possible reason why they seem an overall better bulb.
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Peter
Keeping: Testudo hermanni, Testudo graeca (graeca & ibera ), Testudo horsfieldi, Astrochelys radiata, Malacochersus tornieri and Kinixys belliana.
The North West Tortoise Group
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