OK, I did it...

I finaly bought metal halide for my big terrarium - Sylvania HSI-TD 150W type with 4200 K colour temperature and 13 000 LM light output. When I ran it for the first time (today) I was...stunned to say the least! Colours are amazing and light intensity is almost like natural sunlight on a clear summer day! I opted for a fixture with external ballast which I placed outside terraria to reduce heat build-up. On a basking spot (cca 60 cm from the lamp surface) temperature seems to be around 35, and I plan to raise it a bit (to around 45) with additional halogen reflector. Lamp of this type is pretty expensive (it costed over 200$) but it is worth every penny!

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