Tom, thank you for your input. The one i talk about is showed at Inland Reef online store. I like MH blue ( with good par) to accompany with 2 no 30w actinic. Setup is 1x250w, 2x30w actinic for 55G (36l x 18w x 19d).
Would have to be a bit more specific, "Euro" from who? from Hamilton?
I know of two bulbs called "Euro" 250 10K.
One is extremely blue on the same level as the 12 Sunburst or the Blueline bulbs. Poor lumen output and poor par.
The 10K "Euro" from Hamilton however is basically a 10K German bulb. Excellent lumen output, same white color and assumably good par as well. The bulb is made in Belgium.