which light for chaeto in biocube?

what light are you guys using for the chaeto? is it the submersible light thats available for like $6 and $6 shipping and looks like this?
 

bdhb12

Member
I wish regular stores would start selling those kinda things it took forever to find a good light for me.
 
how do you guys have it in there? just the light in the middle of the chaeto? seems like itd smother the light. i was thinking about using a clear solo cup. thatd keep the cup chaeto back so there would be more surface for the light to hit.
 
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