Expensive but has anyone built a 7cell optic bike light?
I guess the problem is powering the unit due to the vf of the LED's in series.
There's a commercial solution called the LTSS SuperNova 9 that has 7X1W P4's in a MR16 fitting with a 8 degree optic. States 490 lumen.
http://www.ltss.co.uk/content.asp?contentid=619
Presumably it uses the optic similar to this one: http://www.polymer-optics.co.uk/122 - 6 Degree 7 Cell Optic(Luxeon).pdf
I guess the problem is powering the unit due to the vf of the LED's in series.
There's a commercial solution called the LTSS SuperNova 9 that has 7X1W P4's in a MR16 fitting with a 8 degree optic. States 490 lumen.
http://www.ltss.co.uk/content.asp?contentid=619
Presumably it uses the optic similar to this one: http://www.polymer-optics.co.uk/122 - 6 Degree 7 Cell Optic(Luxeon).pdf