Similar in intensity to 5W bulbs. BA15s fitting, ie cap diameter 15mm, single contact, parallel pins. Overall bulb length 32mm, diameter of LED end 18mm. Available in amber, red and clear.
LED bulbs have the advantage of being extremely long lasting and require very little current, typically 30mA. For use on negative earth vehicle only.
For best results use the same colour LED bulbs behind the same colour lenses.