it is all in the reflector Mitch.. there was also a article that said a 150 DE put more power out than a 250 watt and was aproching a 400 watt Iwasaki output.. sence then it has been found that this was because the DEs were tested with a extreamly focusing reflector and the moguals were tested with n o reflector.. sence then tests done on bare bulbs have shoewn that there is no difference.. and like I said it is the reflector than can make a big difference.. if you look at that page you showed me again and look closely you have quoted a stacked test also.. the 175 was on a magnetic ballast and the 150de was on a M81 ballast and unshielded.. to bring this in to comparason you have to shield the DE bulb if you are goign to follow manufactures recomendations for everything els.. so with that shirleded the DE 150 puts out 50.8 PAR and the 175 on the M57 ballst puts out 64.4PAR.. so the 175 is higher..
Steve
__________________
 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
|