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Mercury Vapour lighting

is there much of a difference between mercury vapour lighting and metal 
halide lighting?
i have an opportunity to purchase a HQL mercury vapour light for about 200+ 
SGD. Is this a good buy,
considering the light is manufactured by Bioplast? bioplast OEMs dupla's 
MHs FYI . . .


If you can talk with crowds and keep your virtue,
Or walk with kings - nor lose the common touch;
If neither foes nor loving friends can hurt you;
If all men count with you, but none too much;
If you can fill the unforgiving minute
With sixty seconds' worth of distance run -
Yours is the Earth and everything that's in it,
And - which is more - you'll be a Man my son!