150 Watt 21 Volt EKE/HO MR16 Shape GX5.3 Base Halogen Bulb The history on EKE/HO (item 1001628) goes back 10 years or so. Same life as standard EKE (1000306) at 200 h, but EKE/HO has slightly shorter working distance (WD) at 43mm versus standard EKE WD of 44.5 mm. So optically there are some slight alignment differences. The "HO" lamps, have a slightly modified reflector coating that tailors the transmissivity/reflectivity characteristics in the 330nm-490 nm (nanometer) spectral region which was required for the specific photo therapy application. The “HO” lamp was not designed for general visible light applications like the EKE standard lamp. (UAI item 1000306). The two are not interchangeable especially if they are looking to replace an EKE/HO with an EKE in a system that is currently employing the EKE/HO type.

Abbreviation Name	EKE/HO
Ansi Code	EKE
Base	GX5.3 2-Pin
Bulb Type	Halogen Bulbs
Color Temperature (K)	3250K
Diameter (in)	1.99
Filament	CC-6
Maximum Overall Length (in)	1.75
Rated Life (Hours)	200
Shape	MR16
Voltage (V)	21V
Wattage (W)	150W