The light bulb may be a universal visual metaphor for an inspired idea, which is probably why Polytechnic University came up with this latest advertisement (pictured) to promote its business faculty and graduate studies. But it couldn't have picked a more unfortunate time. What's the first thing that comes to mind when you see an energy-saving light bulb? Could it be our chief executive, Donald 'Bow Tie' Tsang Yam-kuen? Since last week, those bulbs have become bywords for committing a political faux pas. Now, LoDown is not one of those conspiracy theorists who think Tsang was deliberately trying to benefit his in-laws, whose business serves as a major distributer for Philips, which, of course, makes green bulbs. Oversight and haste probably have more to do with Lightbulbgate than nepotism and corruption in the HK$100-coupons scheme to promote the use of green bulbs, announced in the policy address. Thanks to the Bow Tie, compact fluorescent lights now stand for lack of ideas and inspiration. How else can you explain a minor energy-saving scheme being promoted as a major government policy initiative?