EARplugs have as much as 32 db noise reduction. Unfortunately, that is not across all frequencies. I find my Bose cancel out the high pitched wind and turbine engine noise which drive me nuts. It may not be ruining my hearing (per OSHA, but the hearing tests prove otherwise), but what does hearing matter if you've gone insane?
The Lightspeed has not struck me as a durable headset. The more folks I know that have a broken pair sitting at home while they have reverted to their old passive headsets the more my opinion sets.
The Bose X has been in my 'care' for almost two years. It has been beaten severely in my flight bag, dropped a few times, sent back to the factory for a spring upgrade (less tension spring at no charge) via UPS (includes a 6 foot drop), returned (another 6 foot drop), taken sideways and top down hits on the airframe in turbulence encounters, and generally not treated with the kind of care you'd expect someone to take with a $999.99 headset.
But I didn't want a fragile eggshell for a headset. I wanted something that could take it. The Bose X does just that. I can wear it 14 hours in a day and not have hot spots or feel like a tool in a vise-grip. Weight was of utmost importance, followed closely by noise reduction capability.
Noise reduction-wise, I watched my hearing decline for 4 steady years as I flew more and more. I got the Bose. The hearing loss stopped. Then, the hearing improved. I'm back to my pre-flying levels which were more sensitive than the normal population. And I'm now flying an old Cessna Skymaster, which is like being in a aluminum garbage can while two professional drummers play the Anvil Chorus in cut time with large hammers.
Find what works for you for your head and type of flying.
Fly SAFE!
Jedi Nein