Rx7s difference with R7s

jonboy79

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Oct 4, 2013
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I've noticed that the linear halogen r7s bulbs are slightly different, the rx7s's are pinched on the ends. Generally a halogen 400w r7s is around 118mm in length and a metal halide 70w is 114mm to 117mm. Now i'm wanting a cheap water resistant housing and i'm thinking that it will be cheaper to buy a halogen 400w floodlight from ebay for around £8.00 and buy the rx7s fixtures/holders for a couple of quid. The problem is is that on ebay i can't see a lot of rx7s holders, but loads of r7s's. I was wondering if anyone knew the difference.
This is for a aquarium fixture and yes i all ready have a ballast. Regards
 

jonboy79

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Oct 4, 2013
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Sorry for having to bump this, not to sure if it has been lost in posts. Regards
 

Marcturus

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