They are designated MT250DL Clean Ace.
The "R" is for radiation warning:
"R"- WARNING:
These lamps can cause serious skin burn and eye inflammation from short-wave ultraviolet radiation if the outer envelope of the lamp is broken or punctured. Do not use where people will remain for more than a few minutes unless adequate shielding or other safety precautions are used. Lamps that automatically extinguish when the outer envelope is broken or punctured are commercially available. Replace lamps immediately that have broken, cracked or scratched outer envelopes. Be sure supply voltage is shut off before removing the lamp to avoid electric shock. These lamps conform to Federal Standard 21 CFR 1040.30



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