There is no significantly more efficient direct replacement. For the lower energy use you have practically just two options: First use the IR reflective coating lamp type, then the power will be about 250W. It is not that much energy saving, but still some and the lamp is 100% compatible (include the eventual dimmer). The second option is to convert the fixture for MH as Zarlog wrote. The drawback is a higher investment cost and loosing the dimming possibility (unless you use a dimmable ballast, but even then the dimming range is rather limited). Plus it is an HID, so not suitable for short burning timne and frequent switching. For the lamp type I would prefer the CMH (e.g a HCI-T70W/WDL from Osram/Sylvania), but any tubular 70W MH will do quite good job there (select according your color preference and available budget for the conversion)...
There are really no other way that would really work. I've seen CFL's, but these are barely 18W, so about 2000lm (compare to 5..7klm of the MH's). Plus the CFL is really bulky, so it is visible on the top. Recently appeared even some LED's, but they are the same output as the CFL, plus the overheating problems (too small size to handle reasonable power). So I would not use any of these last two...
Edit: I just more carefully read the description of the Zarlog's recommendation and it is indeed a CMH, the picture there is misleading (it shows a quartz type), 1000bulbs does really bad job in correct offerings... But otherwise that bulb should be perfectly fine...
|
|
« Last Edit: June 14, 2016, 04:22:13 PM by Medved »
|
Logged
|