Very good.
Genura lamps are also good, but they have recently changed the design to reduce the spread of the beam because this is apparently more environmentally friendly. i.e. they can get a higher lux/watt figure by making the beam tighter, and thus comply with some clearly stupidly counter-productive legislation. I've not tried the new style.
Also there are these: http://www.mr-resistor.co.uk/products.aspx?g=19&t=98&r=608 but they are a tad pricey.
Genura lamps are also good, but they have recently changed the design to reduce the spread of the beam because this is apparently more environmentally friendly. i.e. they can get a higher lux/watt figure by making the beam tighter, and thus comply with some clearly stupidly counter-productive legislation. I've not tried the new style.
Also there are these: http://www.mr-resistor.co.uk/products.aspx?g=19&t=98&r=608 but they are a tad pricey.